If the Sony AIO has no video input, then VNC (Screen Recycler) is the best option.
What specific parts have you got a problem with?
You can also change your thread title to something like "Need help setting up Screen Recycler with a Sony AIO and a MBP" if you want to go the Screen Recycler route, again, your only option (besides other VNC clients) to extend your display to the Sony, if that AIO has NO video in and allows something like Target Display Mode (like the 27" iMac).
Btw, your current thread title is misleading and not very descriptive.
To edit your thread title, just click on the
button on the bottom right of your original post and then click the "Go Advanced" button below your message.
from the forum rules:
Minor Problems
3. Thread titles.
Use thread titles that indicate the subject of the thread, not generic titles such as "Need advice/help". Moderators may change thread titles that have no specifics, usually by adding something more specific in parentheses.
https://macrumors.zendesk.com/hc/en-us#Minor_Problems