I don't know what happens next???

We've been TTC for just over a year for our 1st. I'm in my mid 30s. We went to the doctor this week and they said they would refer us to the infertility clinic. We asked what happens next, timescales, next steps etc. But they just said they weren't sure.
Anyone know what happens now? We're in Scotland so possibly different to the rest of the UK but any experience and insight would be appreciated.