As for the legality stuff, I wouldnt take everything you read at face value. It is in part about how you and your W agree things.
there is a child maintenance calculator on the CSA website which will tell you how much this is monthly. Your W works and so you should be able to avoid spousal maintenance and there is no good reason that you shouldnt get half the equity in your house - Your W is the one leaving and who had the affair after all.
Speak to a solicitor, preferably a couple if they do free consultations so you get different viewpoints and proper advice. Also then pick the solicitor you are most comfortable with.
I hate to say it but spending a couple of grand now on a good solicitor could save you tens of thousands over the lifetime of the settlement you reach.
All the best OD
When is your next Ceroc outing?
Both mid 30s, 2 young kids BD 7sep14 XW moved on long ago, now living with OM1 D paperwork in progress