Need help matching settings to goals (muscle gain)

Hey everyone,

I downloaded the app this morning. I think it will be really useful for me, especially to track what I eat, but if I'm gonna use the information it tells me about what my daily eating goals should be, I think I need some help configuring my settings. Right now, I'm skeptical that the app understands what I'm looking for.

I currently have a desk job. In the future, I will be starting a job that is more physical, and comes with certain physical requirements. It will all take care of itself once I start, but I'm trying to make it as easy as possible on myself by getting in the right shape in the mean time.

Basically, I need to be in great athletic shape--ripped instead of jacked, no fat, but with strength / muscles. I am currently in good shape, lean and athletic. I need to keep those things up--low fat, in good cardio shape--and improve on them. That's the easy part. The hard part is that I also need to get stronger. I have always had a good workout schedule, and have a good build, but I am on the thin side. I have gone through phases of intentional weight gain and muscle building in the past, so I know a decent amount about the nutrition involved in my situation.

My question for MFP is whether I should tell it that I want to maintain my weight or to gain weight. (Either way, it seems like the suggested fat intake is pretty high. I understand I need to eat a decent amount of fat to fuel muscle creation.) Because the app is mostly used for people looking to lose weight, I am not sure what it means when you tell it you want to gain weight--is it just trying to eat enough calories so that you gain any weight, or is it trying to get you to gain weight the healthy way, by building muscle?

Any MFP advice, diet advice, life advice, etc., is appreciated. Thanks a lot.