if so what would be the average price (pcm) for like a 1 bed/2 bed flat
near the old town.
You won't have a chance on a teachers salary to afford such a thing.
Also i have decided that the best way of getting a job in Warsaw is to teach English, i have previous teaching experience with Children , although i do not have any recognised certificates.
Then your first port of call should be to obtain a recognised certificate.
Is it easy to pick up a teaching job with a BA 1st degree , even if its not specifically related to Teaching?
No. You can pick up work, but anything sustainable and worthwhile will want some form of recognised teaching certificate.
It's also worth noting that - many school directors are wise to foreigners who teach because they can't do anything else - and as has been explained to you before, many of these people end up going back home after a few months with their tail between their legs.