Just got mine earlier this year. Also sat for a very long time. Got it running this past weekend!

For your hatch, order
these from Amazon. Just got them myself a few months ago.
Clutch, sorry, no experience there. Mine is regrettably an auto...
Battery, of course start with a new one. there's debate on the size b/c larger ones can contact the hood if it's not properly restrained. I have the larger but have good restraints.
Search to get a copy of the factory service manual (sorry, don't have a link handy). I'm sure somebody will link it for you or just search. It's INVALUABLE while troubleshooting.
Essentially, you need fuel, air, and spark to get it running. Verify all and it'll run.
I'd really check out your tank. Mine was a rusted mess. Had to drop it, have the inside cleaned, refurbished the fuel level sending unit, replaced all soft lines and filter. Blew out rigid lines.
I also had to rebuild the brakes and replaced all the soft lines and pads.
Theme here is replace the rotted out soft lines and hoses as you go.
Good luck!