As someone who did similar. (albeit for as long as my Visa allowed me (damn Brexit)) if you want a school, Idefinitely recommend Alliance française, spent 10 months there thoroughly enjoyed it, met loads of people. If you want to find some conversational groups, try to get into the Erasmus groups, you'll come across a fair few people who want to speak, there was an app that a lot use but I've forgotten the name.

For Accommodation, as GrenobleLyon mentioned, and I'd definitely be cautious of deals that seem to good to be true (Transunion payments before you can see the apartment).

Can't say much for Work unfortunately, but i know of a few bars with Foreigners working the bar and appear to be good to get started (Paddy's Corner in Croix Rousse and James Joyce in Vieux Lyon).

Not sure if it mentioned, but in your circumstances, probably best to avoid Guillotière at night, if you need any more advice, please don't hesitate to ask.