There is some good information in the replies to "crazyeyebrow" and, unfortunately, there a lot of smart a$$ comments. This is a beginners forum where a fellow traveler is trying to get some help.. How much does a garbage reply help? I'm truly surprised at Pappers remark.. Staff member/moderator/great brewer/etc... You are supposed to help. Crazy is from Ireland and may not write or speak "American" english with the same fluidity as some of us. Try writing in his native language and you might see his problem with communication. That said... (soap box kicked out of the way)
Crazy.. you are on a learning curve. You can probably make some decent beer with this kit. Unfortunately, there aren't any easy answers to this if you really are set on making beer this weekend. You will either have to put it off.. or.. might I suggest you go to your local brewery, ask to speak to one of the chief guys there and see if they will be able to give/sell you what you need. I have found local breweries in my neck of the woods to be very helpful to home brewers.. many of the brewers started in the same place as you are starting.. in the garage or kitchen.
Cheers and good luck, Crazy. I'm hoping to hear the results