58lvl, no Phoenix, lots of questions)

I do not think fosftie is a great choice. Yes it's possible, but what I am using my guild currency is Jyn Erso, Rex and raid gear. Jyn for casian's u wing which will be needed for thrawn ship, rex to counter the now-every-shard meta empire team. For my FO team I am using KRU, Fo pilot, phasma, officer and kylo. FO pilot is the hardest farm by far (2 hard nodes, about 4-6 shards daily), but another bb8 wont come for at least 2 months.
Only capital ships viable endgame are tarking and thrawn. Mace is no way, squid can make it on offense, if you are realy tryharding him I am definitely going for thrawns. I strongly suggest putting some phoenixes together.