OK, guys. I deleted a couple of posts to keep this thread on track and constructive.
Zeus, it's great that you have come to TONMO for advice on the best way to get your tank set up in the limited time you have. You are getting some good responses from people who are willing to share their experience and help you out, but there are also probably a lot of experienced keepers watching this thread and not saying anything because they read 'BTW I am getting one in 2 weeks no matter what, so try and help me prepare, rather than saying I can't do it, help me do it' and either don't think you will listen to their advice or don't think that the short set-up time will be successful, no matter what good advice you get and follow.
The reason people on this thread keep saying that you should cycle your tank for longer is partly because they are hoping you will be able to delay getting your octopus, but also partly because we get new or potential ceph keepers here all the time looking for advice, and we do not want to encourage them to do things the way you are planning to do this. That doesn't mean you won't be successful, and the combined experience of your uncle and those offering you advice here probably gives you the best chance you can have. But, overall, most people starting in this hobby don't have your uncle's experienced input to help them, so we have to stress to others who read this thread later that this is not the way we recommend doing it.
Best of luck.