Who would you like to be with you on the big day? Most Mums-to-be choose to have the father (or other parent, if you're in a same sex relationship) with them for the birth. They will find everything they need in order to be your perfect birth partner in module 7: Support.
Is there anyone else you would like to be present? Your Mum, sister, a close friend? Who are the significant people in your life who you know have a calming and supportive part to play. Do you want them with you or do you want to keep the birth as a special shared experience for just you and your partner? Think about who you want to inform and when. Are you going to tell the world as soon as you go in to labour, are you going to let a select few know, or are you going to wait until Baby arrives (remember Baby will come in his/her own time and the last thing you need is the world knowing that you've gone into labour and expecting an update every 5 minutes). How are you going to inform people? You can plan this with your partner so that you're not distracted or stressed by your phone going off during labour (ideally we want it switched off!). Maybe a Whatsapp group where you partner can update the key people who need to know, or something similar that works for you.
Do you have any relatives pushing to be present but who you really don't want there (Mother/Mother-in-law perhaps)? Discuss this with your partner and decide how to deal with this now. Don't be afraid to make your wishes clearly known. You're much less likely to cause offense by being straight forward about what you want - for example tell everyone now that the birth is to be limited to just you and your birth partner and not to expect a call until Baby is actually here (but of course they'll be at the very top of the list!).
Remember that the most important thing is that you're happy with your choices (it doesn't matter what anyone else thinks - this is your birth experience!).