Here's my comments. If you have a floating gooseneck, then you need the little line secured to the cleat below the gooseneck to secure it from rising when you tighten the halyard. To be legal, most boats have black lines for the tack of the sail near the gooseneck position and another at the top of the mast for the head of the mainsail. These are limits between the two black lines for the hoist of the sail. Your boat may not have them and the fleet you sail in might not care. But, if they do, then you should paint or tape on these black lines where they are supposed to be. If you are racing one design C-22's someone in your fleet will be able to help you I am sure, or a sailmaker can. The cunningham eases or tightens the leading edge of the mainsail which is something you do to make finite adjustments. You don't have to have a cunningham as you can also do this with the halyard, but sometimes, if rigged correctly, it is quicker to do this adjustment with a cunningham. Tightening the leading edge brings the draft forward and loosening it brings the draft aft. Now, the outhaul does the same sort of adjustment, but it does it along the foot of the sail (along the boom). Tighten it and it brings the draft down. Loosen it and it brings the draft up. If you have a 4:1 outhaul adjustment (which is adequate for a C-22), then this job is easy and especially if the wind is blowing hard. I am sure if you buy the products from Catalina it will be convenient, but if you buy the parts separately from your local chandlery, you probably can get a better price, but that is your business. And, as far as where you make your outhaul line fast (on a cleat) depends on where you install the cleat. If you want it way forward then so be it, but I assume you will want to make it internal rather than external and so you need an exit block forward and the cleat will have to be somewhere aft of that position. The boom vang is something that controls the twist in the trailing edge of your mainsail. In heavy air, sometimes this has to be eased in order to make the cunningham or outhaul adjustments. Usually in heavy air the vang is in hard and eased in lighter air and especially as you reach off the wind so that your leach copies the twist of the leach of your headsail. Have fun racing. C-22's have been around for ever and there are plenty of them to race against.
