.htaccess redirects - I am completely lost -

I'm trying to create some redirects using htaccess, but I'm overwhelmed with everything. So here it goes.

is hosted on my domain but no site has been created. I just want to use the domain for "easy" branding I am trying to get it.

I want people who go to my Nudeman domain to be redirected to an external site: blog.OldDomain.com/podcast/

I will also be making new posts for upcoming posts For example, I want to send people to NewDomain.com/1 and redirect them to the blog. OldDomain.com/episode1 will then be redirected to NewDomain.com/2 blog.OldDomain.com/episode2, etc.

I hope someone can help me!

Thank you!