Theres a lot of jobs that say that they offer those with a criminal conviction a job, given that you can provide what it was for and ectera.
Actually through my research, the goverment has a lot of jobs that don't discriminate on criminal conviction. and even offer those out of prison an accelerated application.
My advice would be to research NOW from the get go a list of jobs and see if they say these things, and then email them asking them if they would accept your application with said conviction. This would save you from not doing the applications, but knowing if they would accept you. So then you know i have these jobs that would accept me.
If you want to go into the ambulance sector, then apply the same thing, email a bunch, ask them if you would be accepted with your conviction. see result, have fait, continue studying, then apply.