Help me understand requirements for Support Chat Tool Developement

You must know zendesk chat, zopim, olark, livechat, [login to view URL] etc. I am planning to build service similar to those companies and for that I require experienced people who can guide me with all things related to that. For example, Let's say ABC Chat tool is what I want to build and want to provide solution to a group of people. Now I need to understand, What kind of server usage happens when 10,000 user simultaneously chat with support companies. What kind of server / coding platform / security / database system etc I will need to handle this. F.E I have 1000 website owners who want to experiment with my service (offering them support solution via livechat on their server). I want to keep data of their chat history for specific number of days (f.e 90 days) and I also would like them to provide a streamlined easy to operate chat system where they can just help their visitors without a moment of delay. If you've used any chat support system in the past, you'll understand what I am talking about. This is not a development project, But more of a hobby project. Help me understand everything related to this. Please bid only if you understand what I seek. I am less interested in people who just post with plethora of non-required details without even reading employer's project detail. To be assured that you've read my project description, You can explain what canned response mean and what kind of help a support team executive can get from it. Thank you. Awaiting for great responses :)