welcome! i'm a relative noob too, so feel free to ignore me (
), but i have to agree with the other folks above - build want you want.
it sounds crazy, but that's about it. this hobby, above all other things, should be fun, relaxing, enjoyable.
to start with I would be controversial and say avoid the expensive stuff like Tamiya and Hasegawa unless you get it in a sale. It is worth the money, but you might want to get some practice in first before attacking something costly. I own a few, and I've put them to one side until I feel ready to attack them
Academy has some great new 1/72 models out, very crisp lines, and very inexpensive. Italeri might be more of a challenge because their tooling isn't as precise, but they offer very cheap armour and aircraft in some unusual models. Revell (Euro and US) have lots of good stuff, and Airfix, while showing it's age, is great for some older stuff, especially 1950s/60s UK planes that few others make.
The crux is, you want to paint things, buy the precise more expensive stuff like Tamiya; if you are interested in scratchbuilding, filling, sanding and customising and making the best of what you have, take pot luck with anything else from the shelf