Hello Sir,
Hope you are doing well,
I can help you with setting up Landing and Thank you Page, let me know what ideas you have in your mind and what is your current website, so i can give more better opinion about what you are looking for.
Ideally, it would be great if you can determine, what section you plan to show on the login page and do you have any website in mind which can be taken as inspiration.
looking forward to hear from you.
Thanks