81 Kz440 Carb

Hello I am new to kz440s but i recentley got one trying to restore it, I have no prior knowledge of this bike or bikes in general so i ran into a problem. I finished putting on the gas tank and tried to start her up but she began leaking fuel from the lines that hang down from the carbs and it would not start, my buddy thinks its the floats. Could someone please help me.

It sounds like your buddy is on the right track. The fuel yank needs to be cleaned out so you don't get more junk into the carbs. The carbs will need to come off, pull the float bowls off, the floats and float vales out, the jets out, the mixture screws out, the slides out, and clean all of the passage ways. The float valves needles may have a either dirty or damaged tips. New carb kits would be best, so you get new float valves and gaskets/ o-rings etc.
You need a Factory Service Manual for your bike. There are links to a free download of it posted here on KZR, which you can find using Google search or the search feature here.