Email over 100K Customers

Hey people, I asked this question before, and I got some good feedback, but I'm confused. I have over 100K emails (I don't know who is active). I owned a business for about eight years that went downhill. My questions are the following:

1). I had Mailchimp, and I need to export the list. I owed them money, so that might be difficult. Any solutions?

2). Namecheap sold my domain because I forgot to renew it (tough times mentally). Could I buy a new domain within my niche? I'm planning to send emails out with a new responder.

3). Who do you recommend for an autoresponder?

4). Somebody said to clean my list before sending it, is there a way to do this without spending big $$$?

5). This new domain will not be a website it will be a redirect to a product within my niche.... should I start off with something free, like an ebook?

I appreciate any help. I went through tough times with my business, which is gone. I ran a 7 figure business but didn't make the right decisions and suffered from health problems.

I hope I can get help.

God Bless,

Seems likes a waste of time to me. Old email list that you don't even have access to because you owe MailChimp money?

Mailing is hard. Don't learn all this because you have an old email list. That's not a good reason. Learn all this if you want to become good at email marketing.

You really need a strong match of list + fitting product. Mailing a free ebook is like a marketing strategy from two decades ago. Everyone living in 2024 knows that info is free on Google - no one wants to download an ebook except in extreme corner cases.