Depending on your tolerance and experience as little as 300mg can give someone a buzz, 600-700 should have a new user having a good time. 1000mg + you should wait to see how you respond to lower doses first. Its not like Gabapentin in that you have to take grams of it to get a buzz.
Although this isn't confirmed or anything people have said snorting Lyrica does work somewhat, I've found this to be true only once but in all honesty snorting a pile of powder that big is no good for anyone.