[helen842000]

Why not have several mini-launches?

Launch the free, get feedback and iterate. You could post the price list but make the higher tiers unavailable at the moment. You could offer a wait list or make it invite only after they have tried a free account.

Then when you launch the higher tiers you have a list to contact. Get their feedback and continue to improve.

I think it gives people confidence that you are actively improving the service if they can see a feature set list that will be in the forthcoming paid version.

If it's not costly, don't restrict people on volume on the free plan just yet.

You then get data on the natural usage levels your service gets.This might help you to refine your volume cut offs in future.