You do not select your additional figures (add-ons) through Kickstarter, instead when the project has finished I'll send out a survey so you can tell us your address details, contact details and specifically what you pledged for. You'll be able to select more items than what you initially pledged for, which you'll be billed for via Paypal after the survey deadline has passed.
I'll post an update which will have the full range and their cost as add-ons via this campaign and the cost post the campaign when the range is released via Black Hat Miniatures & Colonel Bill's Wargame Depot.
This survey will sent out 1-2 weeks after the campaign has finished. It'll take about 2 weeks to process the information when the deadline closes, and then a further week to send out any PayPal requests. This step is really important for us to get right so please be patient whilst we process this data.