dotnetnuke support

I need someone familiar with dotnetnuke 3.0 to help me with my learning curve and some features. To provide an initial scope to bid on - i will need this to be done: - Provide .NET code which is a custom dotnetnuke control exposing the currently logged in user id - Take a photoshop JPG of a desired theme and retrofit it to the site skin - Add forum - Recommend Shopping Cart - Advise on best architecture to add additional db tables if dotnetnuke is to be extended but other site instances will not need new tables