In 1967 i bought a new Leica M3. Coming to grips with a Leica, is not a overnight exercise or a month. Using the Leica daily, with a few exceptions, medium format, 35mm SLR for certain pro jobs, i began to appreciate the system. The lenses do flare, not only the Collapsible Summicron. Yet the lenses all seemed to have a special signature. Some have a boxy look(Elmar), Roundness(Summicron) and a lightness often mistaken for over-exposure(Summilux). I've used the Aspherics and find them way too sharp and out of focus backgrounds awful..Others adore them. We are all correct! Your lens needs attention but maybe the better idea is add a modern lens, Voigtlander 28mm or 35mm(matches your wide frame).
Here a really modern, contrasty lens, that fits and balances with the camera.A lens hood is a necessary. A filter to protect the front element a good idea.
Pick one film.. Kodak Tri-X or T-Max(made for scanning, but takes longer to fix) or Ilford HP-5. Slower films are sharper, less grainy but are harder to use in poor light.Use ONE film for at least one year.
i no longer use an exposure meter. A small point and shoot digital as instant "Polaroid". Adjustments have to made to equalize the film to digital. Digital sees way better in the poorer light with same ISO!
Shooting pix! Shoot daily. Maybe one frame, maybe a roll. In a short time the camera will be one with you. Don't worry too much about exact focusing in daylight with small f-stops(f8,11,16) Work with depth of field scales.
Shoot fast. Grab images as you see them.
One morning you will look at a roll and see "your" images. It may take a year, maybe a few months.. Don't get lazy. A Leica is made to be USED.
I use mine in any weather. I live in Toronto. A plastic bag for rain.
No batteries so cold does not kill my shooting.. The heat, well the Leica copes better than me.
Enjoy the Leica. No other camera can make one so hopelessly inadequate, or so simply superb. Give it your all.