Free downloadable wireframe templates can be found here or you can just draw them yourself:
here is a short video on how to use it
https:/www.youtube.comwatch?v=pjUeWOB-9RY
https://speckyboy.comfree-wireframe-templates-mobile-appweb-ux-design
Free app mockup websites
Creating a ‘tagline’, logo, name etc…
Tagline: basically a line that captures what the essence of your solution is
Naming: to come up with a name for your solution, you can use these websites
https://www.shopify.comtoolsbusiness-name-generator
Logo Design:
https:/www.freelogoservices.comstep1
Creating a landing page:
https:/instapage.com (Basic Free Version)
https:/freewebsitetemplates.com
Creating an MVP prototype (as a websites)
Asana is a great tool for tracking bugs/ problems and customer feedback.