Shouta you can play locally with a friend on a 360. You just both can't go online warrioring it up like Mike/Gootecks. You can still work some synergy, practice out combos, get some unblockables down, etc.
Work on all that, go to a tourney, get some sets/money matches in, compete in the tournie, see what you need to work on. Maybe find two peeps there who like to gather up as well for more sessions, etc.
It might not be ideal like the PS3 way of get together at your house and practice against online peeps, but at the same time, you're online experience will most likely be against a LOT of just solo guys, not another 2 man team.