My first air rifle as an adult was a Gamo Silent Cat my boys bought me for Christmas. I spent more on cheap pellets than the rifle cost trying to find something that was consistent. I would have trashed it if it wasn't a gift.
Do yourself a favor and skip any pellets from Walmart. Get some JSB 8.44 or 10.34. My Gamos also shoot quality (Eley, RWS Meisterkugeln, RWS R10) wadcutters very well. Crosman 7.9 HP 500 count tins are the best ones at Walmart but the same in a 1250 count brown cardboard box are much better.
If ordering pellets online, most places do not package them well and the will probably be smashed and bent when you get them. Pyramyd Air, Airgun Depot, Field Supply and my local shop, Ohio Airguns, all package pellets carefully for shipping.
Since then I have bought around twenty cheap break barrel rifles just to see if I could get them shooting decent. Some shoot OK using a rest but all of the Gamos must be held very loosely to keep POI to 30~40 yards.
