1. Get an account with an autoresponder company. They handle
the storing of your email list and also allow you to send out
emails. You can automate the entire process so there is little
work involved once you have your squeeze page up and follow-up
emails in place.
One of the most popular email autoresponder companies is called Aweber, that's who I use and they are brilliant. However you also have Getresponse , Mailchimp and many more. Shop around if you need to but if you want to get started right away I recommend Aweber
2. Offer something of value - free
Very few people will give you their email for you to start selling them something immediately hence most marketers choose to offer something free to encourage people sign up. The free item can obviously be a phyisical product but I personally find how to videos or 2 page reports answering a common question work the best. I use this method most and the best thing is it's really easy to do. 10 minutes in front of a camera or 15 minutes writing an article and your done.
There are loads of other things to do but I suggest to get started with these and then as the thread progresses we can start getting into more advance methods