.htaccess broken links

I am in need of some help with writing some .htaccess redirect rules for a small site upgrade. We re-designed our site and it has now about 70 broken links. I tried putting the 301 redirect in place and it works but it doesn't work for some of the URLs. Your task is to write the code for the .htacess file that will handle all of the redirects. I have all old URL's and new URL's as well. This needs to be done within 2 days of this posting. In your bid please tell me a little about yourself and your related experience.