Auswifey

I've just completed to online application for the Settlement Visa (not submitted yet though) and read through all the info on supporting documentation and financial requirments etc.
I am going to apply via the savings route rather then waiting for hubbys work to give him a transfer.

Can someone please advise if the following evidence is all I need to include with the application:

1) Print final application form
2) Provide current passport and any old passports
3) Marriage certificate- do I give them the original or just a certified copy will do?
4) Evidence of my current employment- letter of offer received
5) Payslips from the last 6 months- is this enough?
6) Bank statements to show the pay is paid into my account
7) Financial requirement evidence- 6 months of bank statements showing the 62,500 in my account
8) Declaration of the source of the above funds
9) Description from the bank of the type of account the funds are held to prove the funds can be withdrawn anytime
10) passport photo (no more than 1 month old)
11) Husbands employment letter- currently in Australia
12) Husbands UK passport- scans of each page
13) Husbands birth certificate- certified ok?
14) Some of our wedding photos
15) letter from husband confirming our marriage and he is sponsoring me
16) Current rental agreement showing we are living together
17) childrens birth certificates- certified copies
18) completed Appendix 2 form

Am i missing any other supporting docs? Do i need to prove any further that our marriage is legit? eg Photos?
We have 2 young children together and they will be coming with us...both with British passports.
I couldn't find any info on what else i need to provide!

Also, In the question how long do you intend to stay in the UK? I put in there 2.5 years/permanently. Is that ok? Or do i put in 5 years?
When will i be able to apply for UK Citizenship?

Any advice would be great! thanks