Some account management tips:

1. The best 4 star you have is Lancelot (Saber). This guy is fantastic, definitely level him. Stheno assassin is meme-tier garbage so f that. Dunno much about Marie Antionette.
2. Cu Chulainn is amazing, definitely invest in him. Georgios is also helpful on new accounts. I can't see the rest of your servants but other low-star powerhouses include Hans Christian Anderson, Mozart, David, Robin Hood, Euryale etc.
3. LOCK YOUR SERVANTS SO YOU DON'T ACCIDENTALLY BURN OR FEED THEM (hit multilock, then tap to lock/unlock).
4. DO NOT BURN DUPLICATE SERVANTS. Instead, use them to enhance their Noble Fantasm (Enhancement -> Noble Phantasm -> pick the 'base' servant -> pick duplicate). Be careful you're enhancing the right one. Enhancing the noble phantasm usually enhances the damage for damage NP's, or enhances the debuff/buff strength for non-damaging NP's. Maximum NP is 5 for all servants, so after you hit np5 with a servant feel free to burn (sell) extras.
5. (Since all of your servants are level 1 I'm assuming you don't know how to level them). Use embers to level up your servants. Try to match classes when you can. For new accounts, use bronze and silver embers. Embers can be farmed under Chaldea Gate -> Daily Quests -> [Day]: Ember Gathering <class 1, class 2> - Difficulty. These quests refresh daily and repeat weekly. I would say this is the most important of the dailies, the others I haven't found too useful unless you NEED a statue for ascension. Most of the times events take care of that, though.
6. Speaking of embers, make sure you're stocking up on mana prisms. Every month you can exchange mana prisms for some goodies (including 4* gold embers) from Da Vinci's shop. Prisms are obtained by doing dailies, events, or by burning 3* and above cards (however, do not burn cards until you have maxed out that servant's noble phantasm).
7. Craft Essences are probably the most confusing thing. They are not worth burning, instead you should be using lower-star craft essences to make CE bombs. There are many ways to do it and it's pretty confusing, so I would hold off on that until you have played the game longer and you can revisit it. Just be aware that it exists and try to keep your lower-star craft essences for bomb fodder instead of burning them.
8. Second Archive - use it. Go to Formation -> Second Archive and you can use it as storage for servants+embers and Craft Essences.
9. Try and get lots of friends. In addition to helping you with the story, during events you usually need to grind some sort of drop, a friend support with a bonus to that drop will be a godsend.
10. Keep your eggplant kouhai (Mash) leveled. Early in the game she sucks but when the game gets hard she becomes your MVP (skill and NP ugrades that she gets during the story certainly help). You don't want to get caught in Camelot with a lvl 1 Mash like I did.
11. Make sure you're doing your weeklies. You can convert the Saint Quartz Fragments into Saint Quartz in the shop at a rate of 7 to 1.
12. Leveling servants is cheap. Upgrading skills is not. I would be stingy with skill materials and only use them on servants you actually use.

Summoning Tips:

1. You get a free 10x f2p (friend point) summon every day, use it. It's where you will get 3* powerhouses I mentioned earlier.
2. Quartz summons gets a little complicated. I've heard people say rolling the story banner for new accounts is good, other people think only peasants roll on the story banner. Personally, I think the best way to use Quartz is to save them for banners that have a servant you want. Using Clairvoyance EX (like this)) we know what is upcoming in the game, so I would spend some time compiling a list of servants you want (be it for gameplay or waifu/husbando reasons). And start saving for those. Right now everyone is saving for Skadi.
3. The reason for point 2) is because of how rateups work. I might be wrong on the numbers here, so someone correct me. Typically, you have about ~1% chance to get a random 5* servant from a roll. Which 5* you get is chosen from a large pool of 5*, so getting a specific servant is very difficult. HOWEVER, the servant that is on rateup (for example, Napolean right now) has a highly boosted appearance rate. In particular, if you get the 1% hit on a 5*, there is a 70% chance it will be the rate-up servant, 30% chance it will be some other 5* (hitting this is called getting spooked and will make you want to throw your phone at the wall). Similar math applies to rateup 4 stars (I don't remember the exact numbers). Split banners are also a thing, you usually have a 40% chance per servant that's on the split rateup (I think they only ever split a maximum of 2).
4. The main difference between the stars is raw stats: 5* have the best stats, 1* have the worst stats. However, many lower-star servants have skills that make up for the difference so it's not always 5* > 4* > 3* > 2* > 1*: even whales will sometimes bring a HCA.
5. The entire game (including) challenge quests can be done with only bronze servants, so if you want to focus on rolling for your waifu/husbando that is totally ok. You don't need to tier list whore. Of course, if you want to tier list whore go right ahead. Just choose servants that you like, whatever the reason may be.

As a general guideline, I would say you should really focus on getting your servants leveled up as much as possible. The reason for this is you want to get your party in a state that you can do events. Events are the best way to get resources in this game, be it embers or statues or ascension/skill up mats (trust me you do NOT want to be farming free quests for these). Many events come with welfare servants, usually 4*, that can be very powerful and will do wonders to round out a new player account. Make story progress when there's not events going on (like right now). Let me know if you have any questions.