ビールーをください。 = Please give me beer ビールーおねがいします。 = (I request) beer please If you are asking for some beer ビールをください OR simply ビールくださいshould be just fine.

Those two sentences have almost same nuance. As we buy some beer in a liquor shop, we tend to say "ビールください". As some staff take our order in a restaurant, we use both sentences or ”ビールで。” .(If you say "ビールで。" in rough way, you could look brusk, though). If someone ask me "so... which sentence do you use normally in restaurant?" I would answer "Both, It depends on my mood. " It's slightly different, hard to explain.