I urge you NOT to use the starter motor to crank it over. Starter motors have tons of torque and are not adjustable if there is resistance. Remove all plugs, inject some engine oil or ATF into each cylinder and wait for a bit for it to distribute itself. Then use a breaker bar and socket to manually turn over the engine. You’ll feel if the rings have rusted to the cylinder walls and can work them loose. The starter motor will just break the rings if they are rusted to the walls. Although it’s possible that the rings are fine, it’s also possible they are not. Depending on engine condition, climate in your area, how the engine was stored etc all play into it. It takes so little extra time to be cautious…why not?