Hi I'm Andy Jeffs,
I'm a professional musician in the South East of England. I record and produce my own music as well as working with other musicians.
I am not a specialist in FL studio but, I am confident in my ability to deliver high quality work using any DAW, I'm sure you're aware that they are all pretty much the same.
I'm not sure exactly what you mean by 'make' or 'remake' existing songs from YouTube but, we can discuss that.
It is hard to provide a time frame for completion without more details of the work but, I'm fairly sure I could complete three songs from scratch in a week and, you're offering 'remakes' so, one week should be adequate.