Email opt in

The next step in my journey is to figure out how to do an email opt in. This has been very hard for me, I have tried a few websites but the issue is that they want to use my personal information to send out to anyone and everyone. Not cool! I want to continue to have my company flourish, as well as offer incentives for people to sign up. I am unsure of what I can do to start this next step but I am looking into it. I will keep you posted in the following days. Any suggestions are welcome!