Little steps at the moment DasRus - take it easy on yourself - you are very raw right now, and although you want to deal with it all RIGHT NOW, it is sometimes better to let the emotions subside a little. Your vision is clearer.
Mediators are often solicitors or paralegals who work with clients to achieve an agreement on how the finances will be separated and on contact arrangements for the children.
Your local Relate marriage guidance service can probably point you in the right direction.
If you are looking at a solicitor, look for a member of Resolution - they take a collaborative approach to family law, instead of an adversarial one.
The best piece of advice I can give you is to try to keep things amicable with your wife. As soon as solicitors become the communication medium, the cost soar through the roof. Better to keep that money in the family po for division than to pay for a nice holiday for your solicitor.
Useful info from Mike, but there are also mediators who are not allied to particular solicitor firms (as either solicitors or paralegals) and are specialist mediators. Don't want to sound trite, but look them up in the phone book/Yellow Pages, or try Google.
If you want a not-for-profit service, have a look at the website of National Family mediation (www.nfm.org.uk) where you will be able to find the one nearest you. [We are members of that org, in case there is any doubt - but no idea where you are so this is not promoting our organisation.] These services will be able to help with financial matters - and will refer you for legal advice separately when this becomes necessary. Generally much cheaper than doing it all through solicitors.
You can also look on the Legal Services Commission webiste for any mediation service in your area that does publicly funded (Legal Aid) work. The category is Family Mediation, which includes finance and children issues.