It's an expression that originated in the works of Shakespeare. If someone is a piece of work, it means that he or she is a very unpleasant person or a bad person lacking morals, etc. Examples: He's a nasty piece of work, Carl. I'd avoid him if I were you.
Making video games can be complicated and confusing, but if ur willing 2 commit, the rest is easy. Just go to Yoyogames.com and download Gamemaker. U will NOT GET VIRUSES!!!!! If you get the free version you can make 2-D games w/ a couple limits, but remember, many 2-D games r professional. If u get the Pro version, you can make 3-D games too!
I recommend learning how to use the Roblox site before starting on your first game. The Roblox Wiki is a great initial resource for this. You should then create an account. This step is technically optional, but in order to publish your games on the Roblox site you must sign up.