Given that I haven't played in over a year, how long should I take to get back into the game?

That is, how many bot matches should I do before playing norms again, and how much time should I spend in norms before I think about trying ranked? I never tried ranked in "the old days"

I almost kinda wish I could reset my progress back to level 1 and default elo, but I don't want to make a new account because I'd lose the champions I've bought.