Nice to see another Bullet player!
If you're looking for combos, they can be found in the combo thread here. At the start they're a few beginner combos to work with.
I'm not a pro Bullet player or anything, but some of the things I had trouble with when starting were mixup/blockstrings and escaping pressure, so I would work on those. Also a good thing to learn is how to take advantage of her moves outside of combos...for example 623c can be used as an anti air against jumping in opponents, however 6B is more reliable for this. Her 41236C can go through bursts if I remember correctly. On an opponents neutral tech you can crossover with an air dash. and j.D...and don't forget about her 720. It's not as good as Tager's, but it's still useful depending on the situation.
I would start out just experimenting with a few things like this. In my opinion, it's easier to see these things happen in a real match as a way of learning them, so if you need any help we can play sometime.