When you are changing the plugs, prior to fitting the new ones squirt some engine oil into the bores via the plug holes. preferably leave it over night to soak in, then turn engine over with coil HT lead disconnected. This will hopefully elimante any possible ring/bore damage due to being sat inactive
Check all your hoses for perishing, especially fuel lines (including those underneath the car). Check the radiator hasn't dissolved too!
Check all rubber parts in the induction system for perishing as you don't want to suck in bits of rubber or old air filter when you fire her up.
It would be prudent to change the flexible brakelines on the calipers as they can swell internally or perish. Give all parts of the braking system a thourough once over. Its the most failure prone area on the car and suffers worse than any other in long periods of inactivity.
If clutch won't disengage or is siezed, wedge the peddle down with something and leave for a few hours/overnight and that normally frees it off.
Good luck!!!
