First time poster here so am hoping I have hit the correct forum for information.

I will be moving to New York from Europe within the next 4-6 months through the company I already work with. I am in the fortunate position to be going through the L1 visa process but am still in the negotiation part of my work contract.

After making a move from my home country England to the Netherlands I am already painfully aware that employment contracts vary from country to country in terms of content and therefore want to be as 'info savvy' as possible during my contract set up for the USA. Would anybody be able to reply to this thread with a checklist I should expect to see stipulated in my contract? Of course salary is something I will work out but things like; should healthcare be included?
is it covered for myself and family or is that something I should ask for?
pension payments
sick leave entitlement
holiday entitlement (is there a minimum)
expat tax reliefs
expat conditions
ANYTHING else that I might need to consider

Any help would be much appreciated and any other moving to NY advice also welcome. For eg, other things I need to register/sign up for when moving to the USA.

Thanks in advance

Emily