I'll cover what you can do with a limited budget; lenses and cameras you already own (your phone for example); and what you might expect to see. I'm not a professional, or even a very talented amateur, but tenacity and the willing to sit out in the dark and get eaten by mosquitoes, growled at by foxes and frozen in the winter does sometimes pay off. I've been taking pictures of the sky and things in it on and off for over 30 years. I started with a cheap Tasco telescope from a catalog company and a 110 film camera glued to the eyepiece - it didn't work well (if at all), but it got me hooked.