Nate Tilley says don't start a business unless you love it. The hard parts will break you if you don't genuinely care. Build around what sets your soul on fire, even though you'll still hate some of the work.
Chapters
If you don't love the game, if you don't love what it is that you do you are just going to give up because that's what any sane person would do. The people that win are the people that really have love for the game, love for business, love for whatever it is that they're doing. Regardless of what business that you get into it is going to be difficult and there are going to be lots of roadblocks. Find what it is that sets your soul on fire, build a business around that and know that you're going to have to do shit that you don't like. I'm not saying you're only going to do things that you like but you really need to be in a business where you have love for the game and when everything is all mounted against you and there's lots of pressure building up and it seems like nothing is going your way that you still love what it is that you do and.