Please give feed back regarding arrange employment!!

[parthepan]

Hi,

I am a bachelor of information technology. I can get an arrange employment from one of my friend he is running a company at Toronto. He is ready to offer system administrator post. Now let's assume like this. Once having landed at Canada by means of skill worker permanent residency visa with the support of arranged employment opinion, after 2 month work if I needed to join with a full time course of a university or college what could I do? Because it will very difficult to carried on part time study with work. Could I resign the job with the terms and condition of employment?     

By the way do you know what informal job offer is?