More Dutch for Kelly

I would like 1/4 lb. of this cheese please? = Mag ik 250 gram van deze kaas alstublieft?
Could I taste this cheese please? = Mag ik deze kaas proeven alstublieft?
How much is this wine? = Hoeveel kost deze wijn?
How much is this sandwich? = Hoeveel kost dit broodje?
Would you like to make love? = Wil je vrijen?
Two herrings with onions please = Twee haringen met uitjes alstublieft