I would toss the old bearings and replace with new if it has been sitting a long time.
You can try to start it with muffs on.Just look under the hood to make sure mice havnt made a nest in it.Also check the lower unit lube and replace it.If possible it might not be a bad idea to do a compression test.New plugs would be good to.
Seafoam is a great product and I would put some in the fresh gas right away.There is also a cheaper product that claims to do the same thing called B12.