Re: First Boat, be afraid. Be very afraid.
What everyone else said, plus...
Where do you plan on going? Make sure you have maps, charts, a GPS, etc. You want to have a good understanding of the waterways you will be on.
Make sure that you have all of the required safety gear plus extra things like tools, fuses, rain gear, bailing bucket, stuff like that.
Also, you want to make sure that you have a bottle jack and lug wrench that will fit the trailer. And, make sure the spare is good.
The little things like that can make all the difference in a successfull trip and a failed trip.
Have fun and don't sweat the small stuff.
