I am 100% certain you are going to get taken advantage of. You walk, talk and sound like a newbie and they are going to see you coming miles away...
The people who get the best deals are:
a) ones that know the industry well
b) ones that buy in bulk and have done so for many years
c) ones that have high degree of expertise in the commodity you are dealing with.
You have none of those qualities and your naivete will work to your financial detriment.