Once your pasta is rolled out, I would make the sauce prior to boiling the pasta. You want to go directly from the water to the sauce to coat the pasta in the sauce. This is the hardest part in cooking is figuring out what order to make everything in. So how I do it: roll and cut pasta, coat the pasta in tons of flour so it doesn't stick, make the sauce (it doesn't take long), put the sauce on the lowest heat setting, and then start boiling the pasta.
If your sauce starts to get too thick, add a little bit of pasta water. Whisk in the pasta water until you get the desired consistency.
Top your pasta with some shredded or grated Parmesan cheese and chopped parsley (really for looks).
Want to add a protein? Try grilled chicken, blackened shrimp, fried shrimp, shredded rotisserie chicken.. really the list is endless!
What about other add ins? Sauteed slices mushrooms, snow peas, steamed broccoli, green onions, sauteed spinach... whatever tickles your taste buds!
Let's talk about reheating... Have you ever had leftover fettuccine alfredo through a restaurant and stuck in the microwave to only pull it out and find noodle in a pool of butter and curdled looking milk? The best way to reheat fettuccine alfredo is heating a skillet on low/medium-low. Add about 1/4 cup-1/2 cup of milk to the pan and then add your cold fettuccine alfredo. Slowly mix over the low/medium low heat until the mixture is thoroughly heated and looks like your fettuccine alfredo!