RFF is actually a support group masked by the passion that folks here have for photography and their gear. 🙂
If you want people to talk you out of things like a Noctilux or a brassy black paint M4 then you'll find that support. Conversely, if you are looking for encouragement to add to your stable of rangefinder gear, you'll also find that here too!
You made a great decision with one of the best combos. An M3 with a DR Summicron is possibly all the camera a person could ever need if 50mm is the way you prefer to shoot. Take care of it and you won't lose money off it in the case you want to sell in the future.
You'll have to find yourself a good hand held light meter now, like a classic Gossen Luna Pro. They are a bit big but incredibly sensitive and when they are dialed in, they are very accurate. If you get a Leicameter that sits atop your camera, make sure you know how to put it on and take it off, lest you scratch the top plate of your M3. I recommend the MR4 over the MR. All of them are about a decade younger and when clean, work quite well and accurately. They just aren't good in low light.
Have fun and welcome!
Phil Forrest