After sitting for so long I'd go through it really well before firing it up.
I'd change the oil & filter in that thing, using cheap oil because it won't be in there very long before it's changed again. Find a way to attach strong magnets to the somewhat-flat bottom of the oil filter. Do you have an old junk computer hard drive you can smash open? There's some really strong rare-earth magnets in them.
After the oil change, crank the engine for a good 30 seconds with the spark plugs removed and the ignition coil wire removed. (make sure you tag the plug wires so you don't get the firing order mixed up.) Removing the spark plugs will prevent flooding and enable the engine to crank faster and let the oil pump work better. It will also let you crank the engine longer before the starter gets hot or the battery gets slow. I'd do this with a charger/booster hooked up to save the battery from deep discharge, especially since it'll be a brand new battery.
After cranking it for a while, put the plugs back in and re-connect the coil wire and give it a go. When it starts, run it at around 1000 RPM or so until it warms up. You'll get better oil circulation that way. After the engine is warmed up, before you drive it, check the trans fluid again.
I'm not sure how long it'll take for all the rust to rub off and make it's way to the oil filter but I'd change the oil & filter after about 30-45 minutes of engine running, using cheap oil again. Change it again after you have added about 500-1000 miles to the odometer, if it works, or 2 tanks of gas if it doesn't.