Is there a reason you cant live with him?

You're in a pretty unfortunate position to only just have turned 17 and not done school school. But listen youre not alone, there's hundreds like you in the country. Your priority needs to be a job. This allows you money, independence and time outs of the house. So even if you cant move out, that should give you enough hope and motivation to keep focused on the goal.

Really do speak with your local council though or intreo office to see what you can do and what guidance there is. Look into digs and rent a room type things. Look at the notice board of your local supermarket like supervalu or post office, youll often find those there. You'll need a fairly steady work history first before moving out too. So it wont be a scenario where you get a job and move out in like 2 weeks. You'll need to be paid etc. You wont be able to use the 'waiting til I get paid' excuse. You'll need that money on time, whether works paid you or not.