My homepage isn't going to have a lot of content. Prob a 5 line paragraph with 4 pics and a navigation bar. Is it better to just cram a lot of content onto the main page or does it matter?
Yes, main page is your main content, and your gateway from SE. 5 Parapgraphs its doesn't matter, combination with image will be better, make sure your main keywords not much competitor in SE
amoeba22, If you want your main page to rank for some keyword(s), then I would recommend at least reaching about 300 words. As long as your content is visitor focused and contains a scattering of keywords, you should be fine.