Making best use of money in service

Hello, I ship out on the 24th on a navy IT-ATF contract. Im shipping e-2 and been studying to get e-3 until i get to a school. I have around 11k in stray debt , with a mortgage of 330k. Current expenses are 2100 a month on said mortgage (including utilities) , and cell bill of about 30 a month. I'm hoping to bust ass and get e-5 asap, but i want to make sure im making my money work the best I can. I was planning on using my enlistment bonus (15k untaxed) to pay off stary debt and put the remainder into some sort of roth. Any other advice or programs i should look into? I also want to look into different investment strategies once i have a decent amount of cash saved up. Any advice/tips id appreciate.