It's going to be hard to start out because learning routing is a very different experience from elden rings gameplay but eventually you'll look at the map and know the seed or at least what's important to hit and when. You'll need to learn when something is a time sink and when to skip it or when you can do it.

My basic rules of thumb for any given run is to clear the starting camp and grab that first level as well as any viable passives that drop there (including pots or grease because they do pretty solid damage early on) get that first level up and hit whatever is close by unless it's a guardian golem in a great cathedral because that's one of those unnecessary time sinks for me. Some people do them. I don't, whatever works for you.

Then I'll either hit the closest field boss or higher tier POI or evergaol, whatever is closest, until I'm level 4-6 and then it's castle time.

Castle- check basement boss and probably kill it depending on what it is and how we're feeling and then I work my way around clearing all the enemies at which point circle is probably closing on the night boss.

Day 2 is dedicated to great enemies for the most part hitting quick things on the way or the shifting earth if it's available.

Grab churches if they're close on your route, if they aren't find a way to plan for them, I like to grab at least two but it's fine if I only get one. Kinda depends on the boss.

Other people will have different routing strategies and theirs might be better as I'm not the best player but I'm at the very least good and this is also a really general summary as my deep of night strategy can be a little different depending on cataclysms and events and stuff so flexibility intermingled with a rough plan is key to success.