Hi astonishing    
Go ahead and upload it.
To be honest, most websites are never finished..Mine's been under construction for two years.    

Just put your index page in there and work from that .  

Upload whenever you get the urge  

Don't put underconstruction images and text up... you don't want that getting indexed on the search engines!

But by all means, upload as soon as you've got something! Its better to have a partial/small site now than waiting a while until you have the whole thing finished.

Just dont put links to the stuff you dont have finished yet instead of putting up lots of undercosntruction notices. They do have a tendancy of screaming 'newbie'. But if you dont put them up everywhere, you'll come across as a pro thats just 'adding more content' instead!  

A finished site.. is a dead site!

- Ed