Big Commerce Customization

I am opening a retail site using BigCommerce for men's clothing and need a few basic customizations added. 1) Adjust the header so that some options are left-justified while others are right justified (and italicized) 2) For every product in a specific category, implement the following customization options in a similar fashion to this: [login to view URL] [i.e. thumbnail options that highlight when selected...multiple pages of these options] 3) Before checkout, a mandatory form must be filled out (measurements) 4) Add page links/areas to the home page similar to "Suit Up", "Measure Up", and "Fittings" in this link ([login to view URL]) **Must be very experienced with BigCommerce so that these are simple and easy changes** -Price is negotiable -Only 1-3 days to complete Please feel free to e-mail for any questions or comments