baorder54,
raymich is right. start small to learn the A6. however, you can try big project, but don't be surprised if you'll lost your motivation in a halfway
about your mmorg: you have to create separate models for armors, weapons, etc. and attach different items to a player with script. for hair you can use different techniques: models (as for weapons in prev. line of my post), change texture, some shader, etc.
Programming (game programming too) is an art to make right decision from many right choices