for reliable skeet results the gun HAS to fit . Try a bunch and when you find one that seems right , look for a used one . GunPost online is an excellent choice to look, Epps in Orillia , Gagnon is Oshawa is good, Tillsonburg Gun shop, Al Flarety in Toronto. Dont get locked into a brand as the gun you have to have, it needs to fit you. Visit a shop or three and tell them what you want to shoot and see what they have. An adjustable comb really helps you get your head over the gun.
Also consider if your really going to get into it , shooting three rounds a week is 4000 shells a year , no duck or pheasant guns shoots that volume so if you buy a cheap gun you'll be replacing it sooner than you think. Also field guns are light because you carry it for hours and fire 5-10 shots , skeet guns have a bit more weight so you dont get beat up by recoil, I've put a plastic ziplock bag of shot into the butts of a couple guns to dampen recoil.
You dont need to buy a Kreighoff (yet) or a Zoli , but dont buy a $600 Stevens. FWIW I may have a few skeet guns, but the one I shoot best is a 30yr old Browning SCS that I bought used, because it fits me really well. It has a custom stock , which was made for someone else , that apparently was exactly the same size as me