Okay, so you're new; we've all been there.
When you start, I strongly suggest you full length resize maybe three or five cases and check to see that they chamber fully and the bolt locks before you go any further. Meaning, don't load a batch of ammo before you KNOW your resized cases are done properly.
Get both a stuck case puller and a bullet puller along with the rest of your loading gear - you WILL need them.
Thanks for your service young man, from an old ex-airman. BUT, I have one fine grunt jar-head grandson-in-law who has been to both Iraq and Afganistan and have another grandson that's on his way to Parris Island soon, so I'm not ALL bad!
God bless you and good luck! (And we both know there is no such thing as an 'ex-Marine'!)