Convert Custom Tag Search Page to WP Plugin

I hired a Wordpress programmer about 5 or 6 years ago that programmed the following: 1. Automatically display all the active tags (with a checkbox next to each tag) from the "Posts" section in alpha order. 2. Allow the site visitor to search posts simply just be clicking on the check box next to each tag. 3. The site visitor can also just type in a keyword search OR do both (tag select and keysearch). The custom code is done and working now. All I need to do now is just convert that custom code to a regular Wordpress Plugin so that I can use it on other sites. I also want to add a couple of new features: 1. Give the site admin the ability to use checkboxes or CSS tag buttons that turn on or off (toggle) 2. Show the results either by hitting the "Search" button or by Ajax (the search results display automatically when toggling tags, etc.) 3. Show (or not show) the number of articles for a given tag. 4. Have it log all tag selects and show how many times a tag was selected. Add a "Clear Log" link to clear it.