Settlement spouse and child visa from India - Urgent queries

[Quentin]

Sorry for the long post, but I was not able to find answer to similar queries on the forum.

I have been working for the same employer since past 10 years. Although, I am on its India payroll, I was working in the UK most of the time. I received my UK ILR visa in 2011. After getting my ILR, I worked in India for my employer from Nov'11 to Jul'12.

My employer deputed me back to the UK in last week of July'12. From last week of July'12 onwards, the employer has been paying me 2 salary components:
1) Indian salary component converted to GBP and deposited to my UK bank account (net salary £14,000 per annum and this is called as Indian salary slip)
2) UK allowance component - this is also deposited to my same UK bank account (net allowance £22,800 per annum and this is called as UK allowance slips)
If I add these 2 components, my gross salary is approx. £50,000 per annum.

My wife and child are going to apply for ILR dependent (settlement) visa from India. I would really appreciate, if you help me with following queries:
1) When do my wife and child become eligible to submit the visa application - Is it 6 months after my entry to the UK (i.e. last week of January since I am working for the same employer) ?
2) What should I mention as my Gross Annual salary and which salary slips should I submit - UK, India or both ?
3) Should I get the salary slips signed and stamped by my employer ?
4) Since I travelled to the UK in last week of July, the July UK allowance component is the lowest (25% of normal monthly amount). As per UKBA Appendix FM-SE "The gross annual salary from their employment as it was at its lowest level in the 6 months prior to the date of application". Should I wait till my January UK allowance is received, so that I have 6 UK allowance slips (Aug to Jan) all of equal amount.
5) My old and new passport copies - should this be notarised by a solicitor ? If so, should all pages in passport be notarised ?
6) Since I had left the UK in Nov'11, a P45 form was generated for me for the year 2011/12. Should I submit this form with the application or will this be taken as a negative as I had left the UK for this period ? I have P60 forms from previous 2 years. As per Appendix FM-SE, submitting P60 is optional as per the current rules.
7) Signed employment contract - Is this a must ? Again, as per Appendix FM-SE, this is optional as per current rules. My employment contract is 10 years old and it is with company's India payroll. I have another employer letter mentioning terms of my current UK deputation, can this be accepted as a ''signed contract' ?
8 - I have rented a property, in addition to tenancy agreement, do I need to submit the inventory document which has reference to the number of rooms in the property ?
9) My wife has a degree, which is shown as 10 points on PBS calculator for English language. Do we still need to submit 'NARIC Statement of Comparability' ?
10) Should a Sponsorship Undertaking Form (SU07) be submitted along with the application. Although, this is not a requirement, I have read about some of the applications rejected without SU07 form.

Many Thanks for your help.