Marketing a Product - Pros and Cons

I am working in Service industry where we have a product which cater's the need of advertising for established and new businesses. I joined last week and I can tell you marketing is not an easy job, you have to understand your product throughly and you can't excuse any questions without answer to a customer. I had a tough time learning this thank's to mock calls we had in our office which improved our selling skills and gaved us some confidence.
I am yet to go for selling to the real market but I hope I will be Successful in this.Basically our company product is bulk sms and IVR outbound and inbound calls. I think it will be easy with bulk sms as it is new advertising medium in India which is also called M Commerce sometimes.
In the end I have to go in market and make every call successful.