Can anyone help in recommending a legal service agency? Thank you in advance.

I have been working on a 2 year contract that will expire in 6 months.

Does anyone know what rules apply to collect unemployment subsidy?

I know that if the company decides not to renew the contract, then I can collect unemployment, in the case I don't find another job.

But what happens if I voluntarily resign my position?

And what happens in the case I get offered a permanent contract, but I refuse this offer? Would I still be able to collect unemployment in this case?

Finally, is there any rule of thumb to calculate the amount of time one will have unemployment, based on how many years of employment you have? I've been working in Holland for 4.5 years, how many months/years of unemployment would be available?

I understand these may be somewhat complex questions, could someone recommend a legal service, lawyer agency, that I could contact with these questions, even if it is a paid service?

Thank you in advance for your help.