The Part 4.1 asks for your employment information, including your Employer name (or company name), position, period (means from 1/4/2006 to 31/3/2007 if you worked for the whole year, if not, states the period, e.g., 2/6/2006 to 31/3/2007 or 1/4/2006 to 25/12/2006), and the total income (means your salary of such period, e.g., $10,000 x 12 = $120,000).
If you are taking the courses related to the job in an approved school, you can fill in the amount of tuition in Part 4.3 (2) or Line 31. You should keep the receipts from such school for evidence in case the IRD asks for it. Your income will be deducted of such tutition fee paid in order to pay less taxes.