Smack where did you come up with the Endeavour 43 is a great boat? We had two Endeavours of this period in my family. They were questionable designs of mediocre build quality aimed at being disposable charter boats.
In terms of learning to sail I would suggest that you start with the US Sailing Basic Keel boat book, which is very basic. Once you have gone through that, get out on the water and sail some. If you lust to learn more, then JJ Isler's Sailing for Dummies is a good next step.
Nothing substitutes for time on the water in moderate sized boats to shorten the learning curve to become a skilled sailor. A basic skill level may be acceptable to you, but if you really want to learn to sail well, I would strongly suggest that you spend some serious time sailing an under 30 foot, simple, light to moderate displacement, tiller steered, fin keel/spade rudder sloop. This will greatly shorten the learning curve. It is almost impossible to learn to sail really well on anything bigger and less responsive.
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay and part-time purveyor of marine supplies