I had a homebirth 18 months ago, it was third birth but my first at home. It seems to me that the preparation unfolds naturally as the time gets closer. Our midwife gave us a list which kept me busy at op shops buying old towels, blankets and sheets and then washing them and preparing them for use. We had nice towels and blankets to catch the baby though! As the tiem got closer I began to prepare the room we were to birth in, and as it became more and more set up, including the pool arriving, I became really protective of the space and not wanting anyone to look in there or go in there, it was quite amazing to experience that sense of creating a safe, clear space in which to birth. My partner was prepared in the male way, the in's and outs on attaching hoses, filling the pool, having the heaters ready with blankets and towels. He also had a lesson in how to use the oxygen if the baby arrived before the midwife, and even learnt how to look at the colour of the baby to know if it needed serious medical attention. We used to spend alot of time in the space talking and praying at times and it really was an incredible place to welcome our baby into. We had special pictures on the walls, and a prayer for the child coming in, candles etc. And then of course the nest of blankets and pillows for after the birth it was really really special.
My advice to you both is to talk about anything that is coming up, sharing your fears and feeling his support 100% behind you, spending time preparing the space and letting it unfold in no great rush s it can take up it's own identity to support you both as you birth your baby.

PS-label the cupboards so anyone could walk into the kitchen and know where to find anything they might need during the labour, food, drinks straws etc