Just don't is the best advise you'll get here. It's addictive, expensive and super expensive if you don't learn to fix your own stuff.

However should you fail to heed my warning variety is what makes a succesful gameroom.
Sometimes you'll want a long game sometimes short. Sometimes a shallow rule set sometimes a deep rule set etc etc. Variety. Not all expensive games are fun and not all cheaper games are boring. As mentioned already, you need to get out and play a bunch and decide. What one person likes the other person hates.