Create & Display New Pages, Add Gategory List & Remove Recent Posts-Rss

WP Brethren,

I am new to WP and need a little help on a few very basic items (please see the URL and site listed below – site under construction):

https://hdtvhometheatersuperstore.com

1. Left-side Category List – how do I create this – similar to the Amazon product page: https://www.amazon.com/Televisions-Video/b/ref=nav_shopall_tv?ie=UTF8&node=1266092011)

2. Remove “Recent Posts & RSS”: Unable to do this from the Appearance > Widgets – Featured Sidebar area. Help please.

3. Would like to add and display on all blog pages an “About Us” and “Contact US” (using the Contact Form 7 plug-in) to the right of What’s New and More toward to the top of my home page. Help please.
I Ncan Create New Pages however they do not display in the What’s New and More horizontal bar.

4. Search: Would like to remove one of the two “Search” buttons on the right side of my home page and all pages on my site. Deleting the “Search” widget from the Featured Sidebar widget does not appear to help.

Many, many thanks – Lawrence Wilson