Thank you for your enquiry.
I can help if you tell me which sections you are having difficulties with.
Is your wife an EU national?
Should fill in separate forms but sent together in the same envelope.
Yes you need to fill out section 5. You are applying in your own right as an EU national and not as a family member of an EU national.
Yes ideally you should send proof of employment in the last 5 years but if you have proof since 2005 send them too. You should send all your payslips and 6 months bank statements
Yes fill out section 5 point A that is relevant to your as an EU national. This section is about residing in the UK and not whether you have residence card.
Yes even if it was just for a few days.
You need to look at the stamps on your passport and travel tickets.