Another thing if you are wanting to start out small is to be aware of the minimum withdraws once you figure out about what your hourly rate of mining is (assuming you join a pool or use something like nicehash) I played around in a few different pools plus nicehash and now I need to spend considerable time in each of them to be able to withdraw what I have currently earned (just using my main PC which has 1 GPU card).

Take a look at whattomine.com. It will give you an idea about profitability for the different coins. Don't forget that some coins do better with certain hardware (some are better for AMD vs NVIDEA or vice versa), some are CPU based and some like bitcoin have specialize hardware (ASICS) that totally blow away anything a regular compute can do.

The main thing is read, read , read (or watch videos) and learn as much as you can. Also accept that your work from the first few days/weeks may all be thrown away and chalked up as a 'learning experience'

Best of luck in your new adventures of cryptomining!