people who married young and moved in together

could you tell me your experience? my boyfriend and i of almost five years want to get married next year but we are both 18. we want to move in together wherever he has to be and i just don’t know where to start. i’m currently living in a toxic household right now and want to get out as soon as possible. please give me any advice you have. how much money do i need to move out of state? what exactly is DEERS? please don’t tell me not to get married because i am doing it anyway! it’s my relationship not yours. any advice is appreciated thank you