Hello I am also working with Touch Events in my project and this PlayMaker is very useful because you save a lot of time, so you can start with the "Touch GUI Event" is very simple to use you just need to create some GUI Textures, then add a FSM on it and add the "Touch GUI Event" on it, once you add this action you can assign the image button that you want so from there you can start to play with the touch Events (Began, Stationary, Move ETC.)
https://hutonggames.fogbugz.com/default.asp?W679 check the Tutorial in the the PM page I created a very good Character Controller just taking these videos as reference and it helps me a lot, once that you finish, i am sure you'll be able to continue.
http://www.hutonggames.com/tutorials_ios_fundamentals.phpAny help that you need please do not hesitate to ask me, I can share all what i have learned until now since I also learned from people who wants to share their knowledge but obviously I recommend that you should start to play with all the functions involved in the Touch events and see what happens.
For Multi Touch there you need to use the Touch Count Action, so there is a Video Tutorial in the Web page, and there is no need to start a new project to use playmaker you can work with your current project and use PM or C#, Java Scripts at the same time
https://hutonggames.fogbugz.com/default.asp?W578