Getting a sign-ip box set up through MailChimp

I am an author who is attempting to attract initial traffic to my website by means of offering a free book on Amazon and other ebook sites. My strategy is to have that 1st free book drive traffic to Landing Page 1 of my Wordpress website, where there will be a "Click here button" to sign-up to receive a second, and same-niche, free ebook and also sign-up with their e-mail address. I DO NOT want viewers to see a sign-in form when they initially arrive to my first landing page. Once that "click here now" button is clicked on Landing Page 1, THEN the viewer will be linked to my 2nd Landing Page, where a sign-up form will appear where I can capture e-mail addresses to my list through MailChimp. Well, I want to know what I need to do on that 2nd landing page, so that once the sign-up form is completed with all necessary info by the viewer, it will automatically trigger and take the viewer to (the 3rd page, called "the download page, " which will contain a pdf as a download)? I hope I have not made this sound too complicated. I am also trying to consult with MailChimp to get this question answered, but as of this point, I have not received an answer.