I'm decent at all the competitive classes, but I'm best at Scout. I have good analyzation skills and pretty good at playcalling, so I would make a good Medic for competitive purposes. If your not good at orders, Rarity, you could do Scout. You and your Scout buddy just have to be able to work together. Tye only orders I would think you would be given from a Medic would be "Come to Mid and help work on this combo."
@Epsilon, most matches are scheduled before the season starts, I believe, so you can hopefully conform your schedule around it. As far as practicing is concerned, whenever you aren't busy.
Also, my buddy gamecrazed1 on steam has a dedicated server he runs from his PC, so I could probably ask him to see if we could set up scrimages there.