It depends on what exactly you are planning to mine. Like everything in life, you want to do a lot of research. I'd recommend watching all the youtube you can and try to find communities and even subreddits that are specific to your coin and scale of your operations. It is 2019, you want to be sure whatever you are mining is still profitable. With the price of power and equipment, it may not be.
I'll give you an example, I used to mine burst and these two videos really helped me out.