In summary: Getting started with a very large project you need to pay attention what? and should i start a base theme or from scratch?
i am starting a very big project with drupal 7. It will be a social media website and contain a lot of data like users info, pages, groups, live feed etc. I will do the design and css myself from scratch.
Getting started this kind of website for good performance in the future what kinds of things I need to pay attention to?
And a specific question: In these conditions should i start a base theme (if so which theme?) or should i create a theme from scratch and do everything myself? How will effect the performance of my website in the future?
Thanks for answers and resources/links about these things you will give..