They are pretty easy to make, but I do have a tip for you.
You can't follow the cooking directions on the package.
Those directions are for a pizza crust, which is flat. The directions may be something like "cook at 375 for 20 minutes", and if you do that, the dough outside will be cooked, but because it's rolled up, the dough inside will be raw.
After I roll the stromboli up, I set the oven for 300, and cook it for about 30 - 40 minutes. You have to eyeball it, and once it starts to turn a nice brown, it's done.
Also, you shouldn't use too much stuffing, otherwise the stromboli will split apart when it cooks.