Hi, Phil,
Welcome to the club! (Some Beemerliebers on the other side of the brand call us a cult.

) Like the government, we're here to help. (Ha!) Seriously, there aren't many problems that you might have that someone here can't happily help you fix; there are
none that anyone
won't lend a friendly message to try to correct. So don't hesitate to ask. Myself, I'm so new to the group, my reaction to some of these discussions is still "

!!"
You have an early model which is in the minority as far as R65s go and there are a few minor differences.
True,
but you have the essentials: frame, engine block, basic design. The R65 was in production so long, it was evolutionary. You don't like the '79's stopping power with the single front diak? There's a retrofit kit in existence that converts to dual disk, which stops much quicker. Do ignition points give you a hassle? It's possible to convert to electronic ignition. Is the '79's center stand a hassle? BMW Motorrad redesigned the R65's center stand in 1982 or so, and it's a dream. Others of us have replaced the BMW stand with a Century Ride-Off stand, and swear by it. (I have a 1983 R65 center stand on my '81 It's a bolt-on, requiring only a return spring about 1 cm. different length. (Longer or shorter, I can't recall at the moment.

) It's great! Is the '79 sidestand a dropped bike waiting to happen? Many of us opted for a Brown's sidestand, and my sense is that those who have one, love it. (I have one, and I do.)
The advice in the previous replies is excellent. Do what our colleagues suggest regarding fluid changes, maintenance, and adjustments, and you should have an exceptionally dependable machine that's a delight to ride. Beyond that point, enjoy the projects of improving lights, horn, and reflectives to make the bike safer, and finding a windscreen to make it more comfortable in bad weather. One caution: there are differing opinions about radical modifications to make the R65 significantly faster. Though some hardy riders have dropped R80 or even R100 engines into an R65 frame, others say, "The R65 does not soup up well; if you want a faster bike, buy a faster bike in the first place." (Your countrymen, Lucky Lou or Steve ("Lighter, faster - where's me hacksaw!") - might disagree on that point.)
Summary: You have a great bike that, with luck and no crashes, will last for decades. (Maybe one of your children will inherit.) A lot of TLC and a moderate number of Euros should make it something that will stand out among a group of parked bikes at a gathering. Enjoy the ride!
John