Don't start it. Drop the tank, clean it, replace the pump. Replace the filter, blow out the lines, change oil and filter, B4 trying to start it.
The injs may be gummed up to the point they must be cleaned. I'd take them out, use some Seafoam and wash them out the best you can, and try to start it. The best bet would be to have them cleaned.
A little shot of oil in each cyl wouldn't hurt, since it's set w/ some of the valves open, and may have some surface rust on the walls. While the plugs are out, spin it over and see if you get oil psi.