Seeing that you are a new member and just getting ready to bite the bullet for something that you want to be able to use for years, make sure you make a list. Go to WallyWorld and pick up a note pad and start jotting down the notes of everything you "want" or "plan on wanting" in the future. Even though you want to save a dolar today, that dollar saved may end up costing you ten dollars down the road. Location is one thing that will contribute to what you want and what you can't do. Country verses city. If you plan on having buddies over all the time, plan on a bathroom for the beer nights. Even if you can't do it today, plan on it for tomorrow. Plan for a TV, plan for a telephone. If you are one that washes their car on a regular basis, plan on at least the bottom half of the garage done with something waterproof plus a drain in the floor. Outlets are cheap. Put in many. When you do put them in, make sure you have them on dedicated circuits. One wall on one circuit, another wall on another circuit, and so on. Plan on more than just adequate lighting. Make sure that you have good lighting above where you will be working on a vehicle. Make sure you have adequate airflow. Ceiling fans are a great way to move air. Plan on stereo in the garage to go along with the TV. If you want, plan on putting speakers in the ceiling. Run some CAT cable so you can have a dedicated phone line, you can have a computer, and anything else that would use it.
Everything is always so much easier to do it ahead of time instead of having to go back and trying to run a line.
Not knowing how you would be running your utilities into the garage, most come in from ground up. Make sure you have a way to run something later on. If you have to bury line in the ground, when the ditch is opened up, add another 2" or so diameter line into the garage. That way, when you change your mind about something later on, you have a run to put the wires.
That's it off the top of the noggin' at the moment