First, you want to attempt to discriminate between a fuel or a spark problem. It could be either, or possibly both. Given the long repose, fuel is probably the most suspect, as others have mentioned. Then again, I recently jump started a vehicle which had been sitting a long time. It started easily on 5 year old gas, and has run fine ever since (six months). Others here have similar success stories.
If you are so inclined, you may be able to isolate this problem yourself, without advanced mechanical skills. Making that attempt is simple and cheap. If you don’t get clear results, then you may have to resort to taking it to a shop, but chances are that will bust your self imposed budget.
Start with the good advice offered by @Remco: provide alternate fuel, albeit in very small supply, with a spray can of starter fluid. Maybe it will almost start, or even run for an instant. If it does then it’s more likely a fuel problem. If not, it’s probably ignition (no spark). To confirm or refute the results of that test, or as an alternate test, check to see if you have spark. A simple and inexpensive device makes this quick and easy:
You can probably buy something similar at any parts store.
If you want to get into it that far on your own, post back what you find and someone here will probably be able to offer suggestions on where to go from there. Good luck!