Question about emails campaign and GDPR? (Need help here)

Hello BHW people! Soon I am about to run a campaign and send people to my LP -Email Squeeze through FB and make them Subscribe asking them for E-mail and Name and once they do it, they will receive an email with a "the file" that they know they will receive already if they subscribe(basically I can set automatically the email to respond to them and give them the file or after they subscribe the "thank you page" will give them a link to download it. So In this way, I will collect emails. I will have covered GDPRs requirements like cookies and Privacy Policy(There are many free templates for these available on the internet so I hope that will to the job) for my LP Email-Squeeze Page. So my question is after they have subscribed to my list and further I decide to start email campaign(with the collected emails which is the goal) and send them CPA OFFER that is associated with something similar to the file they've received and also in the message I keep the requirements to include an option for Unsubscribing and everything that GDPR requires.Am I going against GDPR rules in some way? I'll be looking forward to your answers guys because I am really motivated but at the same time, I don't want to break GDPR laws and rush. Thanks in advance! I'd like the keep it whitehat and stay under the radar! I will be glad if some experienced guys share some knowledge on how I can do it the right way.