461304 Customizing wordpress template

I have a wordpress theme that I need customized. The website is a type of blog that lets users submit posts under various categories. The wordpress theme I'm using is called TDO forums. You would need to download and customize it according to the jpg's I've attached. The homepage contains the most recent posts users have submitted. Below the logo there is a bar containing categories, this bar should also give as link to the 'categories' page that lists all of the categories (because the bar will probably not hold all of them). When a user clicks on a category, only posts within that category show up. (The TDO forum theme already has this built in). When a user clicks on a post, they will be brought to the post page. This page should look like the jpg I provided called 'postpageandcomments'. I'm also have gravity forums which will allow users to submit the post. What I need from a programmer is to customize the TDO forum wordpress theme to look like what I have shown in the jpgs. The most important part would be an understandable stylesheet that I can change easily. I do understand html and css codes but do not have the time to customize this theme. The css file must be clear. Please message me with details on if this is possible, how you would complete it, and how long it will take. If you have worked with customizing wordpress themes then please include a list. ALSO, if you feel you can create a better forum type wordpress theme, that is fine as well.