The bundle has to follow a very strict format. It is set out in practice direction 27A. You can google it.
It needs to include court documents from each of you, court orders and notices, forms E without attachments and any expert reports - valuations, pension sharing etc.
It is put together in sections - usually 4. It has to be indexed and paginated so it is easy for the judge to follow.
Section D is where specific documents that you want to rely on in evidence should be put. If his solicitor is preparing it, they should provide you with the draft index a week or so ahead of the hearing so you can check if everything you want to ask the judge to consider is in there. If it isn't you should ask for it to go in. If they refuse, you may need to prepare a supplementary bundle which you send to the other side and the court a couple of days before the hearing.
It is really important that you set out your case well and can direct the judge to supporting evidence. You cannot expect the judge to have read everything. Remember the focus is on needs for housing and income, now and in the future.