At the beginning, at the discovery stage, the number of visitors will very much depend on the effort you put in to driving traffic to your website or blog.
As a result you may have 10 people visiting or 1000s of people visiting your website every day. At this stage it is important that you are consistent, as no traffic = no sign-ups!
The number of people that you interest enough to sign up to your email list, will very much depend on your offer and it's perceived value and use, basically, if you are getting very little interest in your offer, you need to make it an irresistible offer they simply cannot refuse, AND will gain a lot of use from, target your offer at your target market.
As you build a relationship and build trust with that small group of people that do sign-up, when you initially make an offer, you may only see a few patchy sales but this will improve over time as your group grows.
The funnel is always a trickle down process, where you eventually end up dealing with a smaller number of very interested people rather than a huge group of people that are mildly concerned about what you have to say, and more importantly......very rarely buy!