Adding Clickbank and Paymate, Adding Shipping Charges, Fixing Link installed By Previous Coder,enquiry about contact us tab

H there, I need help in getting a few things fixed up on my current website which was stuffed up bya previous coder. My website is [[login to view URL]][1] 1. Adding shipping charges to it as below: under 500gm? ? ? ? ? ? ? ? ? ? I charge $12 in express post Australia $25 worldwide 500gms 750gms? ? ? ? ? I charge $16 in express post Australia $40 worldwide 750gms 1000gms? ? ? ? I charge $16 in express post Australia $40 worldwide 1000gm? -1250gms ? I charge $16 in express post Australia $50 worldwide 1250-3000gms ? ? ? ? ? ? ? ? I charge $16 in express post Australia 2. Adding Clickbank and Paymate to website. I already have paypal installed 3. Fixing up link that previous person installed. The link was supposed to be set in such a way that if you put a external link ??" (to my ebay website when they want to buy from there) then in the frontend that link will be assigned to the buy now button, if you did not put a link then add to cart and from there to paypal will work. I want this option installed properly as it is not working now though I put my ebay link in. It keeps taking me to the front page of my website. 4. I have a section called newsletter and people can subscribe there but where does it go? The previous coder just disappeared after he was paid! ? Thank you, Aysha