Consultation for changing styles

General information for the website: heating, cooling, plumbing and gasfitters
Description of requirements/features: I'd like someone to work/consult with me for 15-30mins to direct me to the right place to change some styles in the Bridge theme for www.climate.nz
Extra notes: H1, H2, H3, unordered lists... need styling. e.g. http://www.climate.nz/heating/single-room-heating/heat-pumps-ac/ - need bottom margins of say 20px for the heading, need to make sure it's appropriate for other responsive views. Apply an indent for the bullet points. See image below.

I don't want you to do this, I want you to work with me and tell me what the styles are I need to change, so I can do it in the future as well.

The attached image is an example of what needs to be done.