significantly
No, you'd have to acquire a ballast.
Yes - this is your best bet if you can also afford an air-cooled hood w/ fan & ducting. Check ebay or htgsupply. If not, you'll need some CFLs with flowering spectrum.
Good luck!
You'll need a ballast to fire the bulb. With a cabinet of that size, you'll most likely need an air-cooled reflector or cooltube to maintain optimal temps with an HPS (you'll also need fans to ventilate cabinet & light).
Can't afford to buy seeds, can't afford to grow, simple as that
decoration*
Can't spell, lack of sufficient cognitive skills, check
affects*
Strike three, you're out
To put it plainly, no.
I don't know how you paid, but if your billing address is input incorrectly, it will cause delays. Call 'em up, talk to Tony, he'll sort it for you. You've purchased from a solid company, IMHO.