I’m no WP expert by far but here are 2 places you can get step-by-step installation instructions:
https://tomdean.net/wordpress.pdf – 40+ pages with step by step install – includes screen shots and plugin install instructions.
WordPress Quickstart Screencast Tutorial video – https://ia311507.us.archive.org/0/items/RachelCunliffeWordpressTutorial1_0/Wordpress1.swf
Hope this helps!
