Help plox with my team

Chelms

Okay sooo I have played this game a lot, and i have had it a month and a half and just hit level 58, I haven't used much strategy at all, just using characters i like, but im not sure if it is the most effective team i could use with who i have, so looking for some help.
My current team consists of:
Lum 5* gear 7
Jc 5* gear 8
Sid 5* gear 7
Ventress 5* gear 7
Poggle 4* gear 7
not sure about this teams chem but i have a some other people im wondering if i should be building on instead
other toons consists of:
Ima-Gun di 4* gear6
ahsoka 3* gear 6
URoRRuR'R'R 4* gear 6
Chewy 4* gear 6
Talia 3* gear 5
cad Bane 4* gear 3
Poe 4* gear 6
Ig-88 3* gear 5
Im also at 74/80 on vadar
and 48/50 on doku
So any suggestions would be awesome, strats, whatever, any input would be nice, and if there is any people i should be aiming for please tell me, thanks!