Congrats on your purchase. Make sure you look inside the gas tank before you do anything. Old gas kills engines. You should also pull the spark plugs and see what they look like, they should give you an indication of how well the truck ran when it was parked. While you have the spark plugs out I would put Marvel Mystery oil into each cylinder. Then slowly turn the engine over by hand and then oil the cylinders again. The points should be cleaned and re set or replaced depending on condition. Its hard to say about the carb and fuel pump, if it was mine I would get a kit and go thru it. Change the oil. Inspect all the wiring, if all looks good put the battery in, turn the key on and check for power at the + side of the coil. If you find that the gas tank is not useable you can always use a remote gas tank to get the truck running. If you do a search here you will find many posts about getting a truck back to life after its been sitting. Also take a look at the tech tips section.
Good Luck
Don