Migrate site from HTML to Wordpress and retain SEO

[IsaCleanse]

Hi guys this is a 2 part question so hoping someone is able to assist!

I own the www.industrytix.com.au/ website which ive been updating manually in Dreamweaver for last 6+ years, it has very high Organic Rankings for most of my targeted keywords which are:

industry tix
Industry tickets
breakfest tickets
Stereosonic tickets
CUban Club tickets
etc etc - essentially names of events

Im currently about 90% of the way through replicating/improving the content of the website using a Wordpress Theme which is located at www.industrytix.com.au/buy-tickets/ so all the URLs/Sites are currently running concurrently. Im using Eventum Theme for hosting events and Woocommerce plugin for products so there is a slighy disconnect between the 'Event Page' and 'Buy tickets/Product page"

**For example: 
Event page: **http://industrytix.com.au/buy-tickets/breakfest-perth/ Ticket/product page: http://industrytix.com.au/buy-tickets/product/breakfest-ticket-perth/

Next step is to kill off the old outdated homepage and recirrect all the event pages to the new ones - for retaining SEO value is there a best practices for completing this? (I am planning to move the New WP Installation into the root folder from the /buy-tickets/ folder where its currently staged.

For example of OLD to NEW redirrection requirements:
OLD http://www.industrytix.com.au/cuban-club-perth-tickets.php
NEW http://industrytix.com.au/buy-tickets/cuban-club-perth-nyd/

OLD http://www.industrytix.com.au/breakfest-tickets.php
NEW EVENT PAGE http://industrytix.com.au/buy-tickets/breakfest-perth/
Nicket/product page: http://industrytix.com.au/buy-tickets/product/breakfest-ticket-perth/

Any other feedback improvements as far as retaining SEO and not keyword stuffing etc?

Thanking you all in advance for taking the time to read this

[IsaCleanse]

THanks for your responses Abhi and Tammy, does anyone have any more feedback or suggestions before i give this a full re-haul?

[TammyWood]

Direct 301's to the same pages on new format. Submit a sitemap with the old URL's, and submit to Google- this will encourage Google to 'see' the 301 redirects. Once those are crawled, be sure to submit a new sitemap, this reinforces the changes.

[abhigarapati]

Hi Sandi,

Please use 301 redirects from migrating from old urls to new urls. As this will intimate the search engines that the old url is migrated to new url permanently. Earlier i have migrated my word press blog (http://ifsc-codes.in) to asp.net website to maintain dynamic content and huge data. At that time am not sure about this setting and i have almost nullified my Google crawl rate and no organic visitors. After that i have realized how much importent factor is this. So i did some coding techniques to address 301 redirection and right now it is getting better. Use your robots.txt file to redirect these urls. Note: Please use 302 if this migration is temporary. Try to create categories to retain old urls if possible. Hope this will use full.