The court cannot make an order until your financial position is known. In order for your solicitor to advise you on a settlement, s/he will need to know the same information. Also, your solicitor cannot advance any arguments for your entitlement with first ascertaining the evidence to back up any calculations for a split of the matrimonial pot.
Once proceedings are issued there is a duty to provide ongoing disclosure as the case progresses so you will end up having to refresh certain information the longer the matter goes on.
It is worth bearing in mind that without a few market appraisals and a mortgage redemption figure, how are you to know what is a reasonable settlement or not?