I usually look for new shows to watch every season. I simply visit many different anime sites to see which manga is going to get animated or if a certain anime is getting a green-lit for another season. I'd even check seasonal charts just to see the complete list of new anime for a particular season. After checking the list of anime available for a certain season, my list would usually end up with 10 shows which unfortunately decreases to 3 ~ 5 after watching the first three episodes. There's hardly any good shows popping out nowadays so I'm turning to old anime series that I've never considered in the past.
I got a few friends to recommend me new titles to watch every now and then so that's something new for me since I'm usually biased when I pick the shows that's going to be added to my watch list. I read a lot of reviews from many different sites (MAL, AP, etc.) but it's not very often that a review can get me to watch a new anime series or movie.