How much does it cost to pick up your prescription?

I haven't been to the doctors in many many years, I don't remember any of it but I'm 20 now and I've got a UTI, have tried getting rid of it myself but it's just not working so I need to get antibiotics. I'm in England so I'm on the NHS. Once I've been given the prescription I'm not really sure what to do with it, I guess I just take it in to the pharmacy and they give it to me?

And I know that there's a charge when you pick it up but is it a set amount or is it different depending on what you pick up?

Thank you :)