>>4286585I have a Canon m50 Mk2, I started with a Canon EF 70-300mm f/4-5.6 IS II USM that I bought used for ~600. Its a fantastic lens with the m50 because the m50 is a 1.6x crop so you actually get 480mm of zoom for birding, and its very light. Force yourself to use manual and take lots of pictures at different shutter speeds to get a feel for how slow you can push it and still get a crisp image.
I took this pic while I still learning how to use my camera with the above combo.