You really need to get yourself Verified "Level One" before attempting to charge for shipping. You'll get a heck of a lot more bids offering free shipping. It'll only cost you around $3.00-$3.50 to ship that little knife. That's including tracking info. You also should specify method of payment. E.G. Paypal, Concealed cash, Money order, etc. Just some friendly advise from someone who sells and ships knives almost everyday.
I see you're verified now. Awesome! Now bidders will have more trust in you. You still have a lot of trust to earn, but that'll come easily as you sell more items. Have a good evening!!