Redirection Help With My Wordpress Blog (Expired Domain)

Hi there everyone,

This is my first post at Warrior Forum. I would like to share and ask for some advice.

About 10 months ago I purchased an expired domain form a friend of mine. The domain is good (SEO metrics). My aim behind purchasing the domain is to rebuild the website with fresh articles/contents

I posted around 15-20 new articles and 2-3 articles ranked in Google's top results. I am getting 20-25 uniques per day. I have done some common On-Page and did nothing with the Off-page. This are the current stats of my blog.

The expired domain had more than 100 pages and the powerful links are pointed to those pages.
Right now I am thinking to work on the redirection.

I would like to share what I have planned,

Let's say, abcd.com is the expired domain. The domain was on http://abcd.com
When I registered the domain I registered with the https://abcd.com (Currently using the SSL)

Because the blog had 100+ 404 links (dead posts but still has the powerful links pointing to them) that's why I want to take advantage of those dead pages (404 links)

Now, I want to create a resource page where I am going to redirect all those links (dead pages). Later I will add my targeted pages within the resource page to get the SEO juice.

I have some questions:
1. Does this idea make any sense?
2. Should I use any cPanel modification (editing the .htaccess. I checked some articles where they are talking about the rewrite codes. Regarding http to https)
3. If my idea does not sound good then what should I do to get the link juice. My budget is initial. Can't afford to write up those 100+ posts right now.

What should be the solution for me right now?

I will really appreciate this and thankful If anyone has any solution or advice for me. I am actually not experienced with rebuilding and growing an expired domain.

Regards,