Dude........I dont want to be a dick, but you gotta read! Trust me, this is one of the nicer replies you are going to get. First off you gave no information about what kind of drive you have, no one can help you at all without knowing what type of drive you have because each drive has a different yet specific set of software and hardware requirements needed to flash. Second...Do you still have your original dvd rom? If you do not have it then there is no chance that you will be able to flash your new drive. you will first need to extract the key from your old drive. There are several tutorials dealing with every kind of dvd rom drive in place today, and some of them do have pictures. You just need to look in the tutorial section of this site.
Some people here really resent noobs who cry for help with their first post after signing up the same day and give up after a few minutes of searching. Flashing a drive is much harder than finding a tutorial, and if you cant do that ..........need I say more. Please take this post for what it is intended, not to flame or ridicule, but to give you a little kick in the ass and tell you there is no free lunch, without reading and understanding no amount of hand holding will get you through this unless you understand what it is you are doing.
If you cannot manage to understand the tutorial you can search around and there are a few people you could send your xbox to along with the original DVD unit and the replacement DVD that would be able to flash it for you at a reasonable price. People here are willing to help but you must put forth a little effort in order to get a return.