some fixes and changes and add on's in WordPress 3.4.2.

i just recently had a website create working with WordPress 3.4.2. how ever the job was not finished and i need to do some work to it such as , creating a sign up form witch created members , adding a audio ability to play and allow people to download mp3's etc ...i will pay per fix or add i am aware that they mostly will b simple plg-ins so noo need to charge high prices the work is simple at least for anyone who know what to do ...thank u