kw1958

Folks, Total MainStage newbie here. I have lots of amps, guitars, effects etc. Usual guitarist setup. I have a unibody Macbook Pro 2.66 GHz. What do I hook my computer up to if I want to use MainStage? How do I do it? (What cables etc). Can I play through my own amps or is it meant to go through a PA? Anyway I think I have asked the same question 3 times in this note so I will stop now. Thanks in advance, KW PS I am happy to receive an answer in the form of a link.