If you have one or more sales representatives interested in your film, certainly talk to them. But have your distribution and marketing strategy ready before even talking to sales reps, then present it to them to determine to see whether or not they feel that they can help implement that strategy. This is so that you can put their recommendations into context for your film. Remember, your strategy will evolve, so at least have the first draft before you take these meetings. In general you should go to any meeting with the following:
1. Knowing what you want from the meeting or person.
2. Having researched the person you are meeting with so that you know what they want, or can provide for you.
Leaving for the Amsterdam tomorrow. Then to Cannes. Check out the TOTBO site for more information. Comment here or @Jon_Reiss on twitter, or on the TOTBO Facebook page. I look forward to hearing from you.