"concept and approach" -- can you clarify this please?
By concept, do you mean the concept of the paysite system, or the concept of how to manage such a task?
In general, I would start by taking a yellow pad and pen and breaking the job apart into it's natural components.
Identify the parts of the job that you _don't_ know how to price- this gives you your first research goals, finding prices for the components you don't understand.
Establish how much money you have to spend, and start creating a budget. Remember, capital always tells you it has more money than it actually has.
Remember, everything _always_ costs twice as much, and takes twice as long, as your worst estimates. If you follow that rule, you can't go too far wrong.
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