Joining the marines.... Only experienced marines only!!?

Im 18 yrs old working part time and basically im tired of not doing anything important. I cant find a good hiring job and most jobs that hire work the crap outta ya for little pay. I live at homes with moms and im looking to join the marines for a better tomorrow. Not that everything is perfect with joining but i see that as better then being suck with a sucky job. What are the benefits of joining plz give everything you earn also coming out how will it affect you personally.