Create a folder somewhere on your PC - example C:\website
Open FrontPage, the use File->Open Web, and browse to C:\website
Allow FP to convert the folder to a web - it will add several files and
folders.
Use File->Import to import your existing pages and images into the website.
Now build your pages, and test using File->Preview in Browser
If you need another image, File->Import it into the website before you
place it on a page, and only use those images that are in the website.
When the page are ready, use File->Publish Web to publish.
Set the address to whatever your FTP account says, make sure you include
ftp:// at the start.
If the account has FrontPage extensions, then do not use FTP, use whatever
publishing address your host has given you - this will start with
http://.