This is the problem with most skinny guys..they want to bulk up but they wanna keep their 6 pack. Forget about it, it would be much reasonable and easy to bulk up first .. and cut later. Build muscle and mass first, then change your diet by reducing carbs and adding more vege once your bulk target is met.

A famous quote:

"You need to build the house first, before you can start decorating it"

Don't do cardio man.. you will be loosing weight. Avoid all cardio. Eat more..rest more...train HARD!! Goodluck.