If you are consultant led you'll need to give birth in hospital (no home birth). I assume you could argue this if you were strongly against it, but ultimately, you're consultant led for yours and your baby's health.
The most important thing to do with your birth plan, is keep it loose. Don't think of it as a plan, more a set of ideal scenarios.
The common opinion seems to be "I'm going to have a water birth with nice relaxing music and aromatherapy oils and pop a baby out after an hour of gentle pushing".
Then labour arrives and it's nothing like they expected.
Look into different types of pain relief.
I wanted the water birth for my first, but owned early on that I'm a huge pain-wuss and that'd I'd probably want drugs.
I stated on my plan that I really didn't want an epidural, and that I definitely didn't want a c-sec.
I also made a note right on the front page that the doc was in charge, and that if they needed to override my wishes they could do whatever they felt was necessary.
In labour I knew immediately that gas and air wasn't gonna cut it. I was offered pethadine before they moved to epi, which I gladly accepted and that did the trick.
For my second, I made clear that I wanted pethadine, and then pretty much the same as above.
Other than that, birth plans are more useful for things like who else you want there:
(Partner/name) during labour and birth
(Mum/dad/partners parents/names) may visit after birth
(Sister/brother/names) may visit once on ward
No other visitors to hospital.
Do you want immediate skin to skin, or do you want baby cleaned first?
Vit K injection? Drops?
Honestly, research lots; write little. The less detailed your plan is, the better the doctors/mw can get on with their job and get baby here safe.
Be open minded.
One thing you may wish to discuss with OH and write in your plan (as awful as it is to consider), is if anything goes wrong and it comes down to safe you or save baby, which they should do.
It's scary at first, and there's a lot of options available. Lurk over on Tri 3 so you can see what kind of things they're discussing about labour. And lingo you don't understand (wtf is pethadine/pros and cons? For example), either ask, or google, or ask midwife. You'll soon find your way through it.
Google birth plans to see what kinds of things they have spaces for.
The Bump have a good one.
The NHS one is also pretty good xx