I would try to turn the engine over by hand first. Us a 1/2" drive ratchet or breaker bar on the crankshaft pulley. If the engine is seized up, you have bigger problems.
Corrosion at connections is probably your next battle. Remove and clean all battery and starter cables. Use a wire brush to clean the posts and ring ends and a battery brush to clean inside the battery terminals.
You may have to remove fuses and clean connections there as well.
S5 WHEEL SALE POLISHED\CLEARCOATED ALUMINUM
TWO 14" @ $149, FOUR 14" @ $259, TWO 15" @ $169 (5 OR 6 LUG)
SNOWMOBILE TRAILER PACKAGE $229
TWO 20X8.50-10 KENDA LOADSTAR LOAD RANGE E TIRES
TWO S5 GUNMETAL W/CHROME LIP ALUMINUM WHEELS
2 LED REPLACEMENT BRAKE LIGHTS $29
SAME LIGHT WORKS ON YOUR SNOWMOBILE TRAILER
HITCH & COUPLER LOCK KEYED ALIKE $39
REBUILDING HOLLEY MARINE 4160 CARBURETORS - $225 DELIVERED
Email - email@example.com