How can someone who has no capital find the capital needed to start his own business?
Credit, Debt etc. What are alternative ways like?
It really all goes back to how you want to do it.
If you are comfortable with getting in debt to start a business that you truly believe in, then go ahead, by all means do it. However if you don't like the idea of potentially losing your business + being in debt in a young age, then you probably shouldn't.
The main way altcoins raise capital right now is via ICOs.
If your project is altcoin related, then maybe you should try ICOs as well. You do need SOME starting capital though, and a team that is alreday assembled and known, as well as a roadmap. You can't just say "give me 50 BTC i'll do this and that".