Having done it, I realized that it becomes a vicious cycle of never ending obsolescence if you are trying to stay profitable for a long period of time. China has this market on lock for the most part. At home hobbyist can still be fun, and I haven't done the homework, but there are some coins that you can still mine with a PC and GPU and still make a profit.
But for hardware, in the end, bitmain.com is where I would go. Good luck. There is a lot to learn, and keep learning because this is still all in its infancy.