Build a dynamic WordPress LMS website

I will ONLY respond to people who address the following: - Advise on what LMS you have expertise with - Advise on how you would setup the site so it runs fast - Advise on how you secure people's privacy on the site - Advise on what guarantees you can provide that you work won't be anything less than high quality I am seeking to find a resource, that can assist me in building a WP site, that has an LMS plugin installed. The site will be predominantly accessed via mobiles, with some traffic via laptop/desktop. So the end clients accessing it, need to be able to have clear visual feel on a mobile. The site will educate people who are no longer together and have the responsibilities of children, in Australia for the time being. The site will be considered a Psychological site, inspiring people to the best of their abilities. I need initial direction on selection of WP theme, & LMS system to use. So I don't want to pay someone who knows very little about selecting a theme and LMS, as that's a waste of resources. Logo design will be available with a few days, but I'll attach a design agreed upon. I would be expecting high standards of coding, in that any unnecessary code is not just left to allow for potential hacking to be done at a later date. Security will be everything, as people will be providing their personal details which under Australian privacy laws, I have a strong duty of care to ensure I keep them private. Flow. The site needs to 'pop' in a conservative manner. It needs to flow very nicely, with logical navigation. I'll need a main theme, and once we have this theme working, either we need to duplicate this theme, or have some plugin that enables the following. I would like to make very slight alterations, such as a Christmas theme, Easter theme and similiar holiday events.