Job offer came in! - any advice?

I start on Monday after a long search. Any experience at all would help. I could not have done it without this community. What helped you in the first month?

Thanks for writing this out. I went through something close to it last year, and it got easier once I kept a simple log of every call and form.

That is wonderful news. Keep applying for a little while if you have not signed, it is a good habit.