[Stoneage]

First step charge the battery! it is likely dead unless it has been regularly charged. Preferably you would look over the innards of the engine with a bore-scope before rotating it, but usually not is not convenient. Definitely pull through by hand, mainly to make sure that it will turn over easily (in case the cylinders had oil squirted into them, usually not a problem on an opposed engine as it will drain out the exhaust on at least one cylinder and thus be obvious). If the plane has been sitting with mogas in the tanks drain it all and refill with avgas. Use the usual caution with respect to animal nests in the engine and contamination in the fuel.

If you choose to fly it, do a circling climb over the field after take-off to remain within gliding distance while you get some altitude. Be prepared for full or partial power loss at any time.

Just my 2cents --Stoneage