Start with something you have an interest in? If you can make money from something you enjoy doing then you will be quids in and it might not even feel like work.
You can research and research all you like and still not get anywhere because it feels like "everyone is already doing everything" and you may wonder where you fit and get overwhelmed.
So... instead... Start something, now, today or tomorrow, anything! and see where it goes. If it doesn't work, at least you've tried something and you might have spotted something else on the way that you could try next.
I spotted something on TV the other day that I could make out of some wood and I've started making steps towards making and selling the same thing online (I'm not a crafter or wood work person at all). If it works, great, if not, it has been a bit of fun trying and I'll try something else.
If I can help in any way let me know. :-)
Fighting or Accepting - its difficult to know which is right and when.