Maybe get hold of some books from the library.
Approach really depends on the product, sale price, how much the buyer will benifit from your prodct etc.
The most normal approach would be:
- call and find out the name & position of the person you need to deal with.
- If you do get to talk to them, give them a quick outline of your product (key benefits & advantages to the customer) & ask if it's OK to forward some info.
- Post professional looking info
- Follow up with a phone call to the person and arrange to meet if necessary (or ideally just close the sale on the phone...happy days)
Remember, most companies will only order a small quanitity to begin with in order to assess the product & cstomer service - so be sure you can deliver what you promise.