Lots of good advice above.
Don't assume the other boaters know what they are doing. Get all the boating education you can . I highly recommend the US Power Squadron course. IIRC it takes around 7 nights (1 per week) to complete (could be longer as I haven't taken it since 1973) but the information is excellent and you will be more knowledgeable than most skippers on any lake. Definitely buy Chapmans book as mentioned above - it's the bible albeit a tad expensive.
Make sure you have a spare prop - that way you'll never need it.
Have fun in your new adventure.