I just realised I didn't actually answer your question in all that Pepperm1nts. You may have corvettes, you may also have frigates and fighters, though numbers depend on what kind of organisation you're going for. I'd say that Corvettes and fighters could both have in atmosphere stealth capabilities, although given how much of this will be taking place in space, I'm not too sure how useful they'll be. Thats no reason not to have them though, and I look forward to seeing what you come up with.