if you haven't bought any chain, you can go buy some basic #41 chain from your local hardware store or any store that deals with lawn mowers.
you have to make sure the chain is lined up with the motor the occ is very picky... aligning the sprocket is easy for the occ so if its off straighten it out
your running your chain under which works but if you want a CLEANER run, run the chain under the brake arm so the brake cable goes between the chain, you use less chain this way also.
If you need a tensioner use it right before the sprocket at a angle and run the chain above the brake post
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when it comes to your shavings just clean it, grease everything upon installing bar and make sure chain is tight and aligned. :3
also when you get the $$$ get rid of that Barry Mount PLEASE and get CNC mounts.