Track new clients

We already do :) 

Go to "Analytics">"Reports">"Client List" and apply your date range. You'll then be able to see all the clients that were new to your within that date range. 

Hope this helpsp 

I tried looking it just shows the dates they were in, not separated into new/returning. I'd like to see how many new clients for the last week, month, etc

It's not very clear that they are new clients in this reports. It simply looks, as the name states, that it is a client list. However, as I know the vast majority of my returning clients, the list in this report does appear to be new clients (apart from one).