It really takes a lot of practice which is hard for us grown ups to find time for. You’ll get the ollie in no time though! Transitions are a great workout; I wish I had more time on them when I was actively skating but alas it wasn’t meant to be.
You’re probably better off without the flip tricks anyway because they’re not as forgiving to our “old guy” ankles when they don’t go well. I used to be really into gaps and stairs but can’t take the falls like I used to. Same with rails. I’ll still do ledges though.
Shove-its are a good first trick after ollies too if you’re interested.