Hello there, forgive me if this question has already been asked. . .

I have over 6000 books in Calibre and (naturally) they can't all fit on my Kindle Paperwhite at the same time--nor do I want/need them to. Is there a way to create a kind of "playlist" if you will of just the books I want to sync with my device at any given time? I Googled this and watched a video on creating a catalog but I don't think that is quite what I am looking for. I tried it and it just gives me a list of the titles and info but does not sync the actual books to my e-reader.
I suppose it is possible I'm doing something wrong.
I'm a little lost and frustrated so any help you could give me (that isn't just a bunch of links back to YouTube, etc.) would be great and much appreciated. Thanks in advance!