58lvl, no Phoenix, lots of questions)

For arena, talzin is needed to get higher with an ns team, looking forward you have sthan, ackbar and biggs, level and gear them and old ben, then wedge when you hit lvl 69, rebels also get you palp... Ship arena, biggs is vital, youll want tie fighter and scimitar as well...

arena
Talzin will be good reinforcement. She brings alot of power and can take your team to top of arena with right mods. With bad mods you will reach mayby top 100/50. Shes dominating in my arena top.

fleet
get 5 ships and 5 pilots and focus on them 60-70. Preferably ships you got use for later. JC ship got no use for later so i would advice not invest in that.
get the good basic ships : wedge biggs TF FOTF and then one better ship scmitar or slave 1 (slave1 and scmitar takes long time to unlock as shards are rare in fleet shop)
As long as you work on fleet and plan long term you can get good rewards from here. Fleet shards are smaller (2000) compared to arena shards (20000) so get into top 100 should be your goal. Also in fleet arena whales are fewer and teams with lower power can beet higher power teams with luck and rng.

scoundrels
gotta work on those, long term at lvl 70 you see a bumb in the tier of credit heist to lvl 3. tier 3 can give up to 5 mill credits! for that you will need at least 3 scoundrels lvl 70+ with gear9+ and 2 weaker scoundrels around 0 with g7.

If i where you i would make a list of arena team (5), fleet pilots (5), ships (5), capital ship and pilot (1+1) and scoundrel team(5). Then make a priority order and farm them. Everyone makes this different and often players lvl first and then search for advice on the web, so everyone have different basics. Nights sisters are good in arena but problem is none are pilot and scoundrels so price to get higher in arena is you lack in other areas.

For example a player like boba fett in arena team can also be used as pilot and in credit heist, wich saves you gear, xp and time couse you focus on 1 character instead of 3. Tiefighter pilot, wedge,biggs,tarkin,mace and those can be used in two places and so on.

summery

This is a farm and resource game and making smart choices and build for future is the way to go, making short term decisions and spread your self thin on to many farming objectives makes you weak and confused. Resources are limited and should be used at few characters. Then also their are many lists on web and youtube how to farm and where to farm, just use google.

Talzin makes nightsisters. If you want that team you need to spend on her.

Tarkin, Jedi Consular, Tie Fighter pilot, First Order Tie Fighter pilot and Biggs are among your best pilot options when you unlock fleets. The Resistance Xwing isn't good, which is a shame because the pilot can be farmed easily. If IU were you, I'd stick to Biggs from GW and also save some currency to buy ship shards from that store. Biggs Xwing and the First Order Tie aren't ships unlocked for you from the beginning, you'll have to buy a few shards to unlock them.

-Darth Vader and Boba Fett have very good ships, but it takes time to farm the 80 shards that you need.

- Vader's Tie, Ahsoka's starfighter and Fives' Umbaran starfighter all have a dispel you can use vs. taunting enemy ships. This mechanic can save you from a loss in some battles.

-Unmasked Kylo and his Tie Silencer can be farmed from the same cantina node. I've seen players interrupting their farming in Cantina and go for Kylo and his Tie silencer all the way to 7 stars. It's a very fast and powerful ship that can give you an enormous advantage in the first weeks upon unlocking fleets.

If you rank in the top 5 every day, you can get 300+ crystals and then re-invest the crystal in energy refreshes. I'm at a point where the crystals I get form cantina are the ones spent to farm for Ezra and Hera.

I hope this could help you! I'm in a guild where we are advising all our players reaching level 60 how to prepare for fleets for this incredible source of daily crystals.

Thank you for advices, saved up 5000 GW currency and started farming Kylo from Cantina. Looks like I desperately need to build Mother Talzin also, but all my creed go on modules right now)