Customize WordPress Theme "BigBang" by Brankic1979 for www.pumapro.com

My site [login to view URL] needs some work… It is created from the Wordpress template called “BigBang” from Brankic1979. I’ve done a lot of the work myself, and would like to keep the template I’ve started with, if I can achieve everything I need to do. I would like to do the following: 1 - add contact form page (the page exists at [login to view URL] but the contact form is not working properly with the email for some reason. 2 - Optimize mobile site — the "BigBang" template by Brankic1929 has a responsive/mobile layout that works, but I’d like to tweak a couple parameters so it looks better.... When responsive layout is selected, the mobile sight adds a dropdown menu at the top of every page (for site navigation) and I do not like how the dropdown menu looks. Currently the responsive layout it turned off. 3 - H1 and H2 headers needed ( I think -- not too familiar with this stuff) 4 - other things to speed up/optimize site 5 - Submit site-map to google 6 - do other things with google to optimize search/seo/etc (again, not too familiar with what exactly I need to do... but I have google analytics setup already to some degree, and it is working)