CPU mining the simplest, you can mine only cryptonote coins like xmr aeon bytecoin xdn etn.
Research and select yourself what of them have potential, download claymore miner select pool and start
Thanks. You mean cryptonight right? I am punching it into whattomine and most coins are a little bit profitable. I don't mind if it takes 2 years to ROI without appreciation. My Celerons and Pentiums don't do squat so they cost more in the long run and their resale value is crappy.
I will probably do something like ETN or BCN.