Vincent,
I am afraid to tell you the bad news - if your engine lost all the oil, and if it's seized -- you simply must replace the engine assembly. A seized engine will yield few - if any - reusable parts. Obtain a quote on a used engine (with warranty), or a remanufactured engine from multiple available sources.
The best thing you could do, though, is seek assistance through a reputable shop that you can trust. They will be able to lead you down the path of a few different choices on how to rectify your problem with engine replacements.
Of course, it may also be a good time to get something new...but that's going to be for you to mull over.
Good luck, sir,
-Dave