i don't know how to use filezilla. in fact I've never heard of it.
how d i start p a server folder.
and no i don't want to pay for it.

I'm assuming you don't want to pay for it. If you are willing to pay go to hosthorde.com and order a server from them and ask them to put that world in the server. If you want it to be home run youtube should help you with that.

You simply start up a server folder with the jar file and let it create the world and other files then stop the server and replace the world folder in the server folder with your singleplayer world which is in the saves folder in your .minecraft folder. then run the server again and it should use your singleplayer world in the server.

I don't host my own server so I don't know if it's different for me, but do you know how to use filezila?

If you do, then message me and I'll walk you through it.