This isn't for your canton but I think the procedure is at least a little similar.
For my annual spousal B permits, I didn't need any additional documentation from home. I received the renewal paperwork a few months before the permit was due to expire and had to sign again that we're still married, no plans to divorce, etc. I was not working, and my OH continued working for the same company the whole time. So he didn't need to provide a new payslip or contract.
If you're now working as well, then you'll add that info to the section of the form that talks about working (at least my form had a section for employment).
I received a letter telling me when my new permit was ready and had to go to the office to exchange the old one and pay the fee for the new. I think some cantons just mail the new permit with a bill though. Hope this helps reassure you it shouldn't be too much of a process!