MTG Arena

[Ender]

For a more budget deck that will win a lot, nothing beats mono red aggro:

https://mtgarena.pro/deckbuilder/9a63b07046526fe

[Ender]

If you want to practice drafting, there is a draft simulator you can use here: https://draftsim.com/

It is kinda fun just to play around with it a little bit. Ravnica is tricky to draft, because of the "guild" multi-color cards... there are only certain color combinations that are associated with the guilds. Here is how I would rank the guilds from best to worst, which should help you in drafting:

Dimir - Blk/Blu
Boros - R/W
Selesnya - G/W
Izzet - R/Blu
Golgari - G/Blk

I have been doing competitive GoR drafts using gems. They are Bo3 matches, and you need to win 3 matches to break even, which I do almost every time I play one now. When you draft, you aren't actually passing to other players, but rather "bots" that pick the best rated card and eventually they start taking into account the colors they have already. You can kinda see how this is done on the simulator.