speeding ticket in upstate NY, what do I do?

I am a Canadian citizen (Canadian drivers license and Canadian plates) and I was pulled over on my way back to ontario on I-87. I was pulled over by a state trooper and he told me he was following me for 2 towns, and that he saw me go as high as 85 mph, but only gave me a ticket for 75 mph in a 65 mph zone. This is my first speeding ticket in my whole life, never been pulled over before and just wondering what I should do? the ticket says to plea guilty or not guilty and I don't know how I feel about pleading guilty without even knowing what the consequences are. can someone give me some advice on how to proceed?