They won't touch it? They screwed it up, took your money, and won't fix it? I'd be looking into a lawsuit.
You also might want to consider going to another mechanic and explain the situation. I know you said you don't have money but he might be willing to look at it, tell you what's wrong and give you an estimate to fix it. You could then either fix it yourself or take it back to the first guy and insist he fix it.
Otherwise, you need to start with the basics:
Remove one of the plugs. Attach it to the plug wire and set it on the block so the threaded part is grounded. Crank the starter and see if it sparks.
Disconnect the fuel line/filter from the carb and put it in a small can. Crank the starter and see if you get fuel.
If you get both of those, make sure the plug wires are routed from the distributor to the right plugs.
Take off the air cleaner and push the gas pedal to the floor once. Look and see whether the choke closes.
Those would be the initial things I'd do. Then go from there.
1989 YJ - 4.0L
2001 WJ 4.0L