Weird question about basinets

Shiara • Im an 18 year old FTM, engaged to the love of my life, the beautiful man who gave me my perfect little son 😍 15/18/16💙
So what do i put in the basinet? Lol its a pretty basic one, theres just a little pad under a sheet thats built in. But do i just put a blanket in there and that's it? Obviously im a ftm :p what size of blanket ? Can i buy some that fit the basinet? So many questions lol