Can you supply the relevant documentation

Should be “Can you provide the relevant documentation”

How about the shipping fees

The shipping cost depends on the way (should we say method) you choose to get the goods. Express is normally the most quickest but also most expensive way (should we say method). By seafreight (Shoud we say Sea freight shipping)is the best solution for big amounts (should we say order). Exactly freight rates we can only give you if we know the details of amount, weight and way.  (Should we say “We can provide you the exact freight rates once we know the details of order quantity, weight and delivery method). Please contact us for further information.