I'd replace the broken motor mount and inspect the others. It's fair to suggest that if one has failed in operation, it may have put strain on the others and they are all a similar age to the failed one. However, if it's something like the dog-bone mount, I'd just put a new one on as these are prone to failure.
Chances are that the petrol in the tank may have gone bad in the time it's been standing. How to proceed very much depends on how much fuel is left in there. If there is only a small amount, I'd be tempted to brim-fill the fuel tank with fresh fuel and drive it like that. If there is a reasonable amount in there already I'd personally be tempted to try and start it, I'd even consider adding a splash of octane booster to it. If it runs terribly or won't start, at that point I'd drain the tank and add fresh fuel.