OSCommerce Website

I have a few PSD's - a front page, category page and products page - that I need to be placed on an install of OSCommerce, site wide. The design needs to be on all pages. At the top of the design, there is a "products" button, which should show the products in a drop down menu. In addition to this, I need to give customers the ability to type in a word or initials in a text box for certain items so I can place their message on their item. The customer should be able to select font and color of the font. The admin side should allow me to choose which products to do this for, limit the amount of characters and change pricing for the text added. When stock levels get low, an email should be sent to me to notify me of this.