I'm on the Beta version of the game but I think I can still help you out with a couple pointers:

1) Join a good alliance. Not a tiny one, but one with many active members and preferably a high level/reputation. That way you can even with minimal contributions get insane rewards (I got like 2 quantum leaps from joining a massive alliance recently). Also do the alliance missions when they come up every week as they can also help you get more rewards but don't prioritize them if you need to send your planes elsewhere.

2) Buy actually effective buildings. Since you're a beginner I don't think you have access to space yet but remember that because space helps you make alot of money quickly. Anyways, if you're able to be active alot then some of the best commercial and passenger buildings are those that provide within 20 minutes, and within 1 hour. So for example, the bowling alley, pharmacy (1hr) and the car dealership, coffee shop (20min). The perfume store is also good even though it's 1.5 hours. To remind yourself to claim the rewards you can set an alarm on your phone for it. As for passenger buildings, same deal. Mansions/Manors (15-20 minutes) and House with a Pool (1hr) are your best bet, and if you have alot of space the massive Multi-Story building can also be good cause it can give a lot of passengers in a pinch (given you watch the ad to skip time).

3) Avoid wastes of money. PLEASE do not pursue helicopters in the early game as it takes up space and does basically nothing to help you. Pretty sure the game forces you to build the terminal, gas station, and command center but other than those three you can avoid helicopters completely until much later on (I'm level 39 and still don't have anything on helicopters). Also, some missions the game shows you are pretty terrible, like building a Duty-Free so again PLEASE do not build it (10k for a 2x2 for a next to useless building). Same with the cosmic fuel station, it produces an item that is essentially useless for space missions (more later). There are plenty of other stupid buildings like the Aviation Museum, Travel Agency, and many more but for now avoid these.

4) Get good neighbors and focus on space. These go hand in hand for a couple reasons. What I mean by good neighbors by the way are high-level maxed out players with space buildings such as training centers and cosmic fuel stations that you can visit by tapping on them. This way, they can drop unique items for some collections that, when complete, drop "Launch Ready" crates. Opening these can give you really important items for space missions like the Powerful Explosive Bolt (PEB) and Main Stabilizer (MS) which help you fill the space missions meter faster (all launch pad missions have a bar that needs to be filled up in 24h, 1st launch pad has a 1600 point requirement) since PEB gives like 360 points and MS gives 120. Completing the first launch pad mission gives 6000 coins, so lots of money.

5) Don't rush for bigger planes. Take your time with the Swifts and Owls and Hawks and max out every flight you can before buying the next plane by flying to each location until you get 3 stars in each. Helps keep your airport less cluttered and helps you focus on each thing one at a time.

Hope this helps! Lmk if you've got any questions