I've been going out to MilCun for a few years now. Couple of things based on my experiences.
1) Rifle/Scope/Caliber. If you don't have one already, ask about one of the course loaners. Once you take the course, you'll have a better idea of what you really need as opposed to what you think will be good. They'll explain the "why" behind their recommendations. You'll save yourself money in the long run if you tkae the course, then buy something based on what you've learned.
2) Gear.
Essential kit you absolutely will need: Bug spray. Bug spray out there's like fire wood. Think you have enough? Double it. Sunscreen. You'll spend a lot of time out in the sun. Rain gear. There's no such thing as bad weather, only un-prepared people. Camera. When you get out there, you'll know.
Should have. Electronic Hearing Protection. Safer than earplugs, in that they are better for protecting your hearing and you will be able to hear everything going on around you. Therefore they are safer for you and everyone else on the range. Paper and something to write with. Lots of notes to take, get contact info from the others on the course. Shooting mat. Something to keep you off the ground for your comfort.
You should get joining instructions with a recommended kit list. If you have any questions, don't hesitate to PM me.
Aaron Grubin