for your first attempt, it's not that bad.
If i might make a few suggestions...
Simplify your navigation a little. there are a lot of places to go and it can lose visitors.
Try to keep it simple, instead of having Clothing - Men, Clothing - Kids, etc, just have one clothing link and branch off from there. Maybe even put the buttons a little closer together.
If you have any graphics ability, maybe even create the buttons yourself.
There's a lot of info there, you have to design it with ease of use in mind.
As far as the "design" goes, i'm not a big fan of the colours. There is a lot of psycology behind the use of colour. Getting the right ones is very important.
Also, have a really cool header made, it will help get you more creadability.
I hope this input helps, I'm no expert thought!

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