While modeling you should worry. Tris leads to poles. And that's where edge loops ends. Lots of modeling tools requires a quad topology to work proper. All tools that deals with edge loops for example. To convert the quad topology to tris is another chapter, after you are done with modeling :) For topology, and even when…
Here are some things that might help. Although if your aim is to make a game in a reasonable amount of time you might consider downloading free models or buying less expensive ones to use, as modelling characters is the most fun you can have with your pants on, it inst quick or easy. However you could use a free app like…