Calculation of work experience points (different NOCs etc) . . .

Dear Experienced Members

Need your urgent help in below matters

1. The immigration want 1 year of work experience in last 10 years from date of application.
I applied for immigration in Aug 2004 but due to processing time delays, I received letter in Dec 2010. This letter asked for my updated documents along with complete details again.

So the 1 year of work experience will be in last 10 years from today or from aug 2004 ?

2. I have 1 year of work experience in Skill type B (computer programmer) and 5 years of work experience in skill type 0 (manager) - Will i get points for both or only one ?

Which one ?

If i had experience in Skill type A and B, then would they take combined points of both ?

3. I am currently a manager in travel agency. I am also the shareholder and part owner here.
Is this ok and acceptable ? Can i be a shareholder in the company although im applying as skilled worker ?

4. I will get reference letter from my father for this company since he is the managing director. Will this look ok to the immigration or letter will not have credibility ?

Thanks