I need a magento dev expert

General information for the website: We sell fitness products
Description of requirements/features: Hello,

I will need some one to help me with these tasks

1) I would like to edit the main banner on my website www.fitnessculture.gr and make it like this ->https://athlete.olegnax.com/index.php/?___store=us (I can help with images etc I just need the dimension and I will provide everything)

2) I would like to replace the menu with the mega menu like on the demo (ONLY IF IT IS GOING TO LOOK BETTER THAN THE ONE WE HAVE ALREADY) -> https://athlete.olegnax.com/index.php/?___store=us

3) I would like to give you a new email form, that I have already bought and replace the custom one from the site

4) I would like to delete some of the menu option that appear every time a client log in

5) It seems that there is a calculating error on the discount when I apply a discount coupon I would also like to fix this.

Please send me your offers

Thank you.
Extra services needed: Customization
Extra notes: