Hahaha so, not sounding like a native so much as adding r sounds everywhere, which makes you sound a little silly in the south independent of how good you are. Imagine a four year old speaking in a southern drawl here in America, it'd sound pretty odd. See wikipedia's: https://en.wikipedia.org/wiki/Erhua
My comment about those two sentences is specifically applicable to people who have done the first dozen or so lessons of Pimsleur's Mandarin Chinese I, which literally contains the sentence "I would like to order two beers" but doesn't cover the numbers until... not sure, I learned the numbers on my own and was liable to have skipped that part if it came later, but I don't remember them in Pimsleur at all.
My comment about those two sentences is specifically applicable to people who have done the first dozen or so lessons of Pimsleur's Mandarin Chinese I, which literally contains the sentence "I would like to order two beers" but doesn't cover the numbers until... not sure, I learned the numbers on my own and was liable to have skipped that part if it came later, but I don't remember them in Pimsleur at all.