Hum..where to start and what exactly do you mean "taken apart"? I see your in N Dakota. Wet,snowy,cold which will take its toll on vehicles sitting for long periods. Id pull the plugs and dump a ounce or two into the plug holes and turn the engine over by hand several times off the crank bolt to make sure its not froze up. If thats OK then off to the fuel system to see what condition its in. 15 years of sitting fuel could be a mess. Varnished solidified fuel/plugged up lines, gummed up carb,rusty tank that sort of thing. Hard to say without opening things up on that one. Fresh engine oil and filter before any attempts to run it. The brake system may be in need of lots of help from sitting. Rusted metal lines, leaky wheel cylinders,rusty/rotted hardware,nasty spoiled moisture laden brake fluid. This all needs to be looked over closely before hitting the road so you dont end up in a ditch or worst. Tires are likely cracked beyond use so look closely. If/once you get it going on the road and find it worth the investment fresh fluids throughout,diffs,Trans,T case,brakes,cooling system, hoses probably. Post a pic or two if you can. We all like to see stuff brought back to life from the dead.