Advice on getting a ragdoll

Hi :) I'm new to getting a cat for myself and I'm starting this process very early on. The plan is to get a ragdoll kitten when i move into an apartment after I graduate next June. I'm wondering what's the best way to go about it? I love cats and often catsit my friends' cats (they adopted from the shelter). I'm currently living with a roommate who has cat allergies and as much as I love her, I can't wait to move out so I can have a cat companion😂

I appreciate any help at all.