As a relatively new diver, and a long time boat owner I would suggest that you think your way through this a bit more first. I asked the same question earlier this year of a few local dive proffessionals. As a result of thier advice, my boat is still under it's tarp where it stayed for thisseason, and my wife and I have made almost 30 dives this year.
Here's what they asked of me...(I'm paraphrasing of course)
Do you have the necessary diving AND boatng skills to make it out and back safely? If not, get them. Does your dive buddy have those same skills. If not have him/her get them. If you feel that you have them already, read on.
At the very least take along someone WHO KNOWS HOW TO OPPERATE THE BOAT, as boat support. If you and your buddy drift off the boat, and can't make it back (too strong current, injusry, etc), your boat support is kind of useless if they can't start the boat, pull the anchor and pick you up.
Now some basic diving issues before we get to the boat. Do you have all the safety and signalling equipment, and the skills to use them (DSMB, sound device, etc). If not get them first, and learn how to use them. See above re drifting off the boat for a fairly simplistic resason.
Now as to the boat...it should have the following as a minumim...radio, gps, chart of the area, first aid kit.
I am not familiar with the boating regulations down your way but I asume that you have some sort of ship to shore communications. If not get it. (if you're too far out to effectively get your injured/bent buddy to shore in time you'll need to call the USGS. Be up on the proper procedure on how to make a call for assistance, and know your location....one wave pretty looks the same as the other, and they have a tendency not to stay still long enough to be used as a location reference.
I would also suggest that you take an O2 provider course and get an O2 set up.
(some will say this is overkill...and perhaps it is, but I always was a boy scout type)
Stocking and taking a good first ais kit is also a must, but it is useless to have it without proper training.
Also make sure you have adequate safety equipment (throw lines, lights - for low light conditinons) etc. Like with your diving, make sure your don't exceed your boating skills or take on more weather and conditions that your boat can take.
Rememeber that your boat is more than just a means to get to and from a dive site. It's your dive platfrom, and rescue, first reponse vehicle, and in the case of an emergency, your on-water ambulance.
If you take your boat two hours out from shore and encounter a dive accident situation, not having any one of the above items and skills/training, could turn your boat into a hearse.
IMO, your best move would be to make sure you've developed both your diving skills, boating skills, and rescue skills before you try this or at the very least have someone with you who has these skills. Have the right gear for both the diving and boating, THEN perhaps you'll be ready.
Here's your worst case scenario (it's a nightmare and chances are rare that you would find yourself in those conditons, but it's something to consider....Murphy is watching ya know)
You and your buddy head out for a nice afternoon two tank dive, but the all the local and close to shore spots are blanketed in a sea of dive boats, so you head out just a little further to a slightly more remote shallow reef. The sun is out, the wind is up just a bit, there a slight current and very little chop in other words a great day to dive.
The two of you hit the water and life is great. You descend 40 feet to the reef, put your newly developed nav skills to the test, and head off down the reef.
Things are going great, when suddenly your buddy get sliced up badly by some sharp rock, coral or old rusted out wreck that he accidently drifted into. You get him back to the surface, but you've drifted a bit far off your anchorage and there's no one on the boat who can run it. You slog you,and your buddy, against the mild current, with him still bleeding, and your exhausting yourself. By shear feet of will, you make it back to the boat but now buddy is panicing, injured and heading into shock. You stuggle against fatique and his weight to get him into the boat and finally do so. Now as you do not have a radio to call for help, or first aid kit, you wrap up buddy as best you can with the limited cloth available, then head back to shore with buddy still bleeding out. You make it back to the dock/boat ramp and frantically run to pay phone, or your car for your cell phone to call for help. All the while your buddy has been steadily going down hill and is now out cold. The ambulance arrives after another 30 minutes...by the way, your buddy is probably going end up a dive accident statistic.
Now you don't need to be an uber rescue diver to go out a few hundred yards off-shore and hit a local shallow reef, and have a few great days diving. Chances are you'll never get into a situation like the one above. But until you're skills are developed, both boating and diving, you're tempting Mr. Murphy, and he can be a most unforgiving teacher.
So I ask you again, are there are a few more questions you should be asking yourself before you "hoot" on out there on your own.
Personally, I'm glad I left the boat beached this year. Diving with others has greatly improved my skills, and I've met some really great folks along the way.
Safe Dives.