Transferring from Desktop to Website

Hello! I have a quick question: How can I transfer the server running on my desktop to a website? I want to know because I have to constantly turn on the server when someone wants to play on it and a website host is much safer. I also have a lot of plugins running on the server, and starting over is not an option because of how much is already built on the server. I would also want to do this for free. Thanks in advance!

 

What is an FTP client?

 

I downlaoded the FTP client, so what do I do now? @timtower

 

How do I transfer the files? Sorry, I'm really new at all this stuff @timtower

 

I downloaded FireZilla and I found the username, password, port, and server name from the host website. I entered it in correctly, it said it was successful, but when I go on to the server, it is just some random world and none of my plugins are there! Please help! Also, I selected the server folder from my desktop and it shows it in the right side that that's is the file I chose, so I know I selected the right file. @timtower