Google not picking up articles think xml site error

Hi, i have a couple of problems with my site. I had a guy working on it but they have seemed to have caused problems. I wanted them to update the site but they decided to start from scratch.

problem 1. They have installed yoast xml but i am not sure it is set up right as none of my articles are showing up in google. a couple of pages from the site are showing up but only a couple and none of my new posts. I have put in google site:headlineplus.com and none of the articles are showing

problem 2 I have set up google webmaster for the site and i have it under https://www.headlineplus.com but the site is set up as headlineplus.com. when i tried to change the site to https://www.headlineplus.com some of the plugins stopped working so i had to change it back. When i do fetch in google webmaster it comes up with redirect. also i was expecting some crawl errors to come up but none have.

problem 3. google does not seem to be indexing my site which i think could be associated with problem 1

if anyone could help with any of these problems it would help me a lot. thank you

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