Welcome,
You are not alone,
I grew up in NYC so hunting isn't something I grew up with.
Always fished and did the outdoors thing.
I started hunting in late 20's and am 40 now.
I still stick to small game simply because a deer is just too much meat for just me.

Rare occassions I do go for deer.
There are lots of how to's online,
But nothing like getting your hands dirty the first time.
Key thing to remember is you don't want to contaminate the meat, so make that your priority when gutting,
Don't worry too much about the rest,
And a good processor will help.
Good luck, and any specific questions feel free to ask