I was interested in brewing my own beer and thought about getting one of the iBrew systems after christmas to test the waters. I mentioned this to my brother, who then very kindly came up with all the things I need to brew my own beer from kits for christmas

So, he gave me a hand getting my first brew started yesterday (the above mentioned wherry) and it has now started to bubble away nicely. My question is this, when it comes to kegging up, it says to add sugar to the brew. My brother also supplied me with a bag of spray malt (Ritchies Light Malt Extract). Can I add this instead of sugar when I keg the beer? If so would the proportions be the same?
Oh and is it bad that I am already eyeing up other kits to brew when my first one hasn't even finished yet!
Many thanks
Simon