You should also be able to upload themes from within wordpress now that you got it set up. No real advantage except you don't have to unpack and you don't have to open filezilla. If you're going to start editing your theme look into notepad ++. Free text editor made for code (highlights it nicely to help find your way around. Also use www.w3schools.com as a reference. Remember that once you edit a theme you'll need to copy this edits over if you upgrade the theme or you'll lose them.