newbie need help

dawnxxOO85

I succesfully jailbroke my iphone 3gs but i want mms and cant figure it out i cannot send/recieve pics my phone is on att network but it is factory unlocked and i have striaghttalk sim/service. I also have no clue where to go for cydia apps help pls i have no clue what i can do now since i have jailbroken