recently got into origami and how do you guys practice?

I reckon follow your passion. Fold what you like, but not too far outside your competence level. Going for stuff that bogs you down too much will dampen your enthusiasm, or worse, make you quit. I have a display tray on a wall showing my new models, and a box to put the old ones i want to keep into. See one of my old posts with a pic of my tray.

Just keep folding most days, doesn't matter if you finish a model or if it's perfect, just acquire the skills.

Repeating models is probably more helpful than folding new ones, although also less interesting.

I have a display shelf, but I'm also ruthless with throwing old folds out. Good (and relatively flat) models can be framed as wall art.

Do a LOT of origami, with various difficulty.

I recommend to use Robert Lang's book for reference. His book called "Origami Design Secret" and "The Complete Book of Origami" just great for beginners that want to learn about Origami better. for Complex fold, Satoshi Kamiya's book always be my favorite.

where do you store your origamis?

Just put them as display on book shelf, some just laying around on my desk.

This isn't efficient but it does make me feel better about creating stuff that I'm not interested in keeping: I give my trials away (people can rarely see the flaws that I see) or I leave them in public places, like between cereal boxes on the grocery shelf.

I store my new origamis in a box and my old ones in a cabinet.

You practice while making origami. Either you fold a model you haven't made before, and get it right the first time. Or maybe it takes you 3 tries.

Or you make a model you already mastered, and try to make it look cleaner, smaller or add more details.