Help with Paypal IPN script Install

Hello I have created a web stores at [login to view URL] and [login to view URL] using woo commerce with Paypal as the only cart option.. The Premium Binaural Beats site works correctly 90% of the time, meaning that when a customer orders they get the e mail with the downloads. However it seems that if customers order as a guest they are never sent the e mail with downloads. Free Binaural Beats I just converted to a store and the store / paypal communication is not working at all meaning that when a customer orders woo commerce gets the order but then cancels it after a short while. A little research says the free binaural beat issue is due to paypal IPN settings and I would guess the Premium Binaural Beats problem could be resolved similarly. I have looked at all the info on IPN's but unfortunately it is just a bit beyond my understanding. I really don't get how to "get my script" for paypal and also how to install whatever is needed for communication on the website side of things. I am looking for someone who has experience with paypal / woo commerce / install scripts to help walk me through this process. I would really appreciate someone who can kind of "show me" how to do it rather then do it themselves as I have several other websites I will need to apply this to in the future. I have some knowledge of html and css and think with a walk through tutorial and someone to ask questions to I could figure out how to do it. I am looking for someone who can help me with this without having to get into all my back end stuff on paypal and wordpress by helping teach me through the process. Please post Paypal at the top of your proposal so I know you are real! Thanks for looking.