Your employer is doing you a disservice
If your employer is asking you to assume a sales role without providing you with training (general sales training) then they are doing you a disservice and not providing you with the tools you need to succeed.
Are they providing you with a script? (questions to ask, the possible answers, how to respond to each answer)
Have they training you in the common objections you should expect to receive and how to handle them?
Have they provided you with information about your competitor's similar products and why yours are better?
Here is one resource: SalesPractice.com is an online community of sales professionals, many of then with years of experience, whose mission is to help people just like you accomplish their sales goals.