Now, it all boils down do this, the whole goal of building your list is to be able to monetize them as quickly as possible by sending affiliate offers.
Since your list is in the Internet Marketing niche, it will respond very well to Make Money Online offers. The best place to find these offers is to go to MunchEye.com.
MunchEye is where product owners post their product launches to get affiliates to promote their product. On this site, you will find the latest offers which you can promote and earn commissions from.
Usually these products are hosted in JVZoo or in WarriorPlus. So if you do not yet have an account in any of them, I advise that you sign up first.
Now, just click on an offer and you will be directed to their JV page. Inside their JV page, you can also get all the tools that will help you to promote that product like banners and the email swipes which you can send to your subscribers.