Hi, my name is Marsha, and although I have an ileostomy, I've had it for more than 50 years. There were no support services back then, and doctors released us into the kind hands of "visitors" ostomates, who helped us navigate maintenance the few supplies that were available back then. I was 15 when I had my surgery, so believe me, I wasn't all that careful, and tried all kinds of things back then. In more recent years, I went from using a flat (Convatec) wafer to the moldable convex wafer. My stoma has shrunk considerably and has pulled back (mostly on the bottom) into my belly. The moldable wafer allows me to form a "neck" around the stoma, which really helps with leaks.
Since I have an ileostomy (large intestine/colon) was removed, irrigation is not an option for me. But people who do it (once a day, or every other day) have virtually no leakage in between irrigations. For protection, they may decide to wear very small pouches (which just collect air and any mucus or fluid that might leak). I'm not sure what a "plug" is... different companies give the same product different names.
Remember, the stoma belongs to you and is part of your body. Don't be afraid to experiment... with products and with food. I used to be able to eat just about anything, but as I've gotten older, different foods have started to cause problems. I no longer eat dairy (had been allergic as a child) as it triggers loose output that leads to dehydration. I was never much of a coffee drinker, but my doctor no longer wants me to drink coffee (decaf or otherwise) due to kidney dysfunction. Coffee without milk or cream is no fun... so now it's water.
Best of luck to you. Stay in touch and let us know how you're doing. Marsha