I will hopefully be able to answer all of you questions:
The cost for premium is dependent on the amount of Networks you have. The first Network is $99/Month, for every Network after that the cost drops to $39/month.
for our initial pilot of the Producteev we would like to start small and we want to have three to four people use the software on PC, surface, iPhone, Android phone. How many licenses do I need to buy?
If they plan on sharing one network, it will only be $99/month.
Can we upload users as we eventually would need to maintain and manage upwards of 70 users?
Yes, if more members need to join a Premium Network, they certainly can, you will only be billed for that one Network.
Would we be able to obtain a longer premium trial version?
Unfortunately, we only offer 14 day trials.