I'm creating a
I've never done this before and wondering if anyone has any ideas of how I could go about doing this and also what tools you recommend for this
If you have already identified the landing page templates that you are planning to use, then you can do this using simple lightweight html landing pages in combination of an email service like mailchimp.
Simply embed the mail capture form on the landing page, then you’re good to go.
As for having the landers on the same domain, you can give Landerlab a try. It’s already packed with hundreds of ready to use landing page templates 
Thanks, will give this a try. Do you have any recommendations for a landing page to use for pre-launch with timer?