Most people on this board have no clue how good 5.0 players are. Most think they are 4.5 around here and they would probably barely hang-in in a real 3.5 USTA league play.
Sorry, I like your ambition, but reaching a legit 5.0 in a year is impossible. It is possible to get to strong 3.5 or 4.0 level and you may be able to rally okay with a 5.0 player, but to get to 5.0, you need some help from genetics. Unless you already are a high level athlete, your chances of EVER reaching 5.0 is low let alone doing it in a year.
Anyone telling you different has no clue how good 5.0 players are.