There is a knack for making homemade gnocci and I've linked you to the recipe. But if you aren't that adventurous you can buy the gnocchi at the store or the Italian Store and go from there.
This gnocchi is made from ricotta cheese and the ricotta gnocchi recipe comes from my web surfing. This recipe sounds simpler to make and only takes an hour to make.
Now for stuffed shells you start with your basic crepe recipe. Once you have your crepes you stuff them with Ricotta Cheese mixed with eggs and grated cheeses. Put a spoonful of the cheese mixture onto your crepe and roll the crepe into a shell shape.
|Crepes filled with ricotta and baked|
Again, you can be lazy and just buy the large shells at the supermarket but you still have to soften them by boiling them part way before you stuff them.