Best Approach to Build a Product Launch Website That Actually Converts?

I’m planning to build a dedicated website for an upcoming product launch, and I want to make sure it’s not just visually appealing, but also optimized for conversions, performance, and SEO.

Here’s what I’m trying to figure out:

• What’s the best tech stack for this kind of site? Should I stick with static site generators like Next.js or go for a CMS like WordPress with a landing page builder?
• What elements should absolutely be included on a product launch page to drive early interest? (e.g., email signups, product teasers, countdown timers, etc.)
• How do you optimize the site for speed and mobile users, especially on launch day when traffic spikes are expected?
• Are there any tools or frameworks you’ve used that helped you launch quickly while still keeping things professional and conversion-focused?

I’m mostly coming from a web app/dev background, so marketing-heavy websites are a bit outside my usual comfort zone. Any advice, examples, or lessons learned from your own product launches would be super helpful.

Thanks in advance!