Hey Brian,
Thanks for your post and welcome to the dark side. Here's exactly what I'd have you do:
1) Read this
2) Start at 200/400/120 and go up from there with carbs and fat to make sure you're gaining weight
3) Stick to 5's. You're likely a novice as we define it because I think you will be able to put weight on the bar readily if you eat, don't do other stuff, and stick to 5's