Advice on cloud based databases (Zoho creator)

I am a busienss coach I have a client who by Monday 3/3/15 will between 700 -1000 leads deliverd by csv file. I need to have an online database that multiple people can access and post the results of the outbound calls to a cloud based diary / calender in real time. There could be as many as 5 telemarketers using the data to make calls and there will be 6 different response to the call. The most important response to diarise is an appointment time for a specific sales perosn.