Debugging script

I have an expired iscripts multicart script. But i found out that the script needs debugging. Alot of the script is written wrongly and details are not shown. I realise it will take me alot of time to clear up the bugs as i'm not really yet that good at it. I need someone who is familiar with php to help me debug some parts of the scripts so that i can use it properly. Would even be better if this person has some experience with multicart. This job shouldn't be too hard for someone who is experienced in php. Problems are quite simple like orders not displayed where it should be.