SEO / BULK AI Poster

Hey,   1.I would like to know how I can automatically can create a Meta Description into my article? Right now im getting problems from YOAST SEO where it shows me that meta description is missing.   2. Also I would like to know how I can add like 50 Titels that I can close it and everything will be automatically in the background, creation, posting. So to full automate the process.   Thanks