TIER 2 change of employer

[Mak111]

Dear all,
Could you please help me in the following situation.
I am currently on my first Tier 2 general visa which was for 3 years with 3 dependants , but currently i was accepted by another employer to start a new job in which he will provide me with a new COS for 1 year.
My questions are:
1. I will apply for an extension on my tier 2 to change employer, should I include my dependants in the application as they still have 2 more years on their Tier 2 dependent visa?.or they just can keep that without a new application?.
2. During my first application i paid a health surcharge for 3 years for all of us (and one year only have passed since then), can i use that reference number in the new application ? , or should i pay for a new one?.
3. If I to apply for all at the same time , can I choose the same (premium )day visa option just for my application ( to avoid paying for every one), and keep my dependants on the standard visa pathway?, or it is a must to apply on the same pathway for the dependants?.
4. what documents do i need to provide for me and my dependants?.
5.My notice period for my current employer is 3 months, and I understand that the visa could take up to 8 weeks in the standard pathway , but my new job should start not beyond 3 to 3 and a half months from now, so should I wait for my visa to change first, before giving my notice ?( which might take 4 to 5 months),or give the notice now and hope for the best?.
thank you very much for the help in advance.
MK,

[CR001]

Why have you started a new topic again with the same question you have already asked and received an answer to? Please keep your questions in one topic.

uk-tier-2-employer-sponsored-visas/tier ... l#p1514152