Request British council to send the results to NBPNP, there is an additional fee for this server, include the LOE with the acknowledgement receipt when sending the full application.
Assuming that you have sent EOI based on Open Category, it will take 2 -3 months to receive an ITA, after which you will have 45 days to submit full application and again it would take approx 3 months to get the nomination.
Better to get signed from non-family members,as I have heard case where Wife has signed and they mentioned wife cant sign the form. They have asked resend the form with someone else signed.
You should have received an automated reply after signing up. Confirmation email on the venue would be received a week before. In my case I have signed up on May 5 and got event dates last night for June 11 session.