need advice on entering in this world.

hello... I am in charge of international sales and selling ultra sonic level meter. to be honest, I have no idea about this kind of products and just took
over this job from my co-worker who ran away, left heavy duty for me.
Nowadays I am studying about level meter and sludge meter and open channel flow meter etc. but It is very hard to understand because my major was related to Media.
For beign successful sales person, what should I more study? and where can I get the information about ultra sonic measuring instrument?
Could you recommend the high-reputation exhibition of these instruments and trade web site?
I am looking forward to hearing kind advice from all around.
Thanks.
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to the world:

Sure, You should hire me as a consultant in the industry.
Look at Endress Hauser Polysonics Fischer Porter
These are the better known ultrasonics around today, at least in the US. You have a tough job. Dozens of ultrasonic companies have appeared in the past few years and pricing has dropped. The good news is that there are a lot of stupid mistakes that designer put into these instruments. You should get someone who has had to make these things work in the field.
Look at where the market is. Water and wastewater industries use lots of these items. I would guess that the petrochemical industry also use a lot.
Is your company producing ultrasonic Doppler flowmeters too or is it just open channel and flow? Some companies are producing hybrid units that measure flow in partially filled channels by both Doppler and level. Customers seem to want these units. Polysonics seem to be held as the best on the market right now but I see a lot of improvements they could make.
Ask me some more specific info. Ultrasonic measurement systems has been my company's biggest product to install and commission over the years.
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