you don't know what you want- I guess you should figure that out first. Like why would you go with UDK, what are the alternaitves. Is this for you to learn UDK or to actually make a platformer game? Because if it is about the 2nd you better have a look around alternatives to see what gets you to the goal the most…
actualy i want to use UDK because of its easy visual manipulation , also i work with UNITY , i think that i need to check this platformer tutorial and decide wich engine im gonna use and you're right i didnt do much research .......auh.... thank you !!!