Hello Megan.
I'm in the very fortunate position of being in excellent health and never having had to make any sort of benefit claim, so I have no wisdom in that regard, I'm afraid. I would like to say up front that I really admire you for wanting to move forward and thinking about work.
Trying to go through things logically, what do you do these days to occupy your time? Are you looking to do something like you were before, or would you rather do something very different? Would you feel able to work full-time, or were you thinking more part time? What sort of things do you like to do?
On a more formal tack, I've had a bit of a Google around, and there seems to be a fair bit on t'internet. I appreciate that's not as good as a face to face meeting to talk things through, but it could help you formulate your thinking and give you an indication of what might or might not happen with your benefits. I'll copy and paste a few web addresses, that came back for me. I Googled "How to get back to work after a long term willness".
http://www.acas.org.uk/index.aspx?articleid=3904
http://www.totaljobs.com/careers-advice/unemployment-advice/how-to-return-to work-after-illness
https://nationalcareersservice.direct.gov.uk/advice/planning/Pages/longtermsickness.aspx
http://www.nhs.uk/Livewell/mentalhealth/Pages/returning-to-work-mental-health.aspx
Really, really good luck with it all.