A good, free editor is Nvu, which works on all operating systems.
A good, free FTP client (used to upload to your host) is FileZilla, which again works on all operating systems.

To learn the basic commands, you can't get much better than the W3Schools tutorials. I've also written some of my own based on those tutorials (which will be up on my blog when I get it finished), and will be carrying on into areas that the site doesn't cover too well.

If you need any more help, you know where to find me.