Learn French: Je voudrais un peu de lait et beaucoup de sucre, s'il vous plaît. - I would like a little milk and a lot of sugar, please.

Je voudrais means "I would like" and is the standard, polite way to ask for something in French. While Je veux means "I want", using it in a café or shop can sound demanding or rude to French speakers.

Why is it "de lait" and "de sucre" instead of "du lait" and "du sucre"?

When you use expressions of quantity like un peu (a little) or beaucoup (a lot), they are always followed by a simple de (or d' before a vowel). So, even though you would normally say du lait for "some milk", it changes to just de after un peu or beaucoup.

Could I end this sentence with "s'il te plaît" instead?

It depends on who you are talking to! S'il vous plaît uses the formal vous, which is perfect for ordering from a waiter or speaking to a stranger. You would only use s'il te plaît if you were asking for milk and sugar from a close friend or family member.