Start with what you know how to do.. decide what you want in your site.. as the need arises.. learn more.. visit the library, ask lotsa questions… hire someone..whatever works for you 
When I joined here, HTML was it for me 
. . . coming together sloooowly but surely.. I also found that using a Portal .. while I learn was super helpful! Joomla, seems to be pretty popular.. Godaddy doesnt support it, so I found something they did support