Adjusting an existing drupal theme template

I already have an existing drupal 7 theme template, with a fully functioning example website. The site is currently live on a server, but the theme needs custom adjustments/tailoring to meet the need of my company. Jobs include: - Creating a new set of vocabulary/taxonomy, switching the new sets out with the ones currently used in the theme template - Reconfiguration of what nodes to be displayed where. This job mostly consists of just switching out what nodes are going to be displayed where. As I mentioned, the site is already functional and I do not need to change any functionality of the template. I just need to change the information. Feed links and template data may have to be adjusted to properly display the new set of taxonomy vocabularies. As an example: currently the search engine can search by the categories of "car maker, car mileage, car price, etc", but I would like those categories to be changed to "music genre, cost range, etc". Feel free to contact me for clarifications, and I will do my best.