I say get your feet wet with a cheap easy smoke. Chicken. Just take the chicken make it dry, put it in the smoker, when the internal breast is 163 degrees pull it and rest it 20 to 30 mins. How hard is that. Close the door and leave it closed.
Over your smoking career you'll do more chicken than any other smoke IMHO. Its the fastest and most delicious when done right.
I say, save your mesquite this time, its a strong smoke. Just use the apple. Next time experiment with just a little bit of mesquite. Don't get me wrong I love mesquite but you most learn first how much to apply so your different meats are still delicious.
Nekkid Chicken gets my vote to learn on.
Don't be afraid to mess up either, some of my best smokes were the ones that didn't go as planned.