When emptying your bag it is very important that you clean the area were the bag is clipped/velcroed thoroughly. If it's velcroed it can be problematic to clean — if not clean you will get a smell.
There are three major vendors of ostomy appliances — Coloplast, ConvaTec, and Hollister. They all make 1 and 2-piece appliances. Convatec and Hollister both make adhesive coupled appliances also. They each have multiple families of appliances. Body type, stoma size/height, and adhesive skin sensitivity are factors that dictate what appliances work for you.
Depending on whether your ostomy will be permanent or temporary is a factor in how much testing you are willing to conduct. Since vendors supply free samples you should plan to test products from all three vendors. If temporary, once you find a product that works you can stop testing. If permanent you owe it to yourself to test products from all three vendors even if you encounter an appliance that works — just because a product works does not mean another one will not work better. I tried multiple products from ConvaTec while in the hospital and additional products from ConvaTec and Hollister while in a rehab facility. Since being home I have also tried multiple appliances from Coloplast. All three vendors make barrier rings, try them all not just ConvaTec's Eakin. You can also sample barrier extenders to further enhance your adhesion.
The one thing I have found to be indispensable is a support belt. All three vendors sell support belts. They generally are of the 1 in width variety. I prefer belts 2 in wide and I wear a belt 24-7.