Hi Kadge
the only fees you need to find before you go B is the court fee of £485 each. payable in cash on the day (check with the county court as some you can pay before the day)
this link
http://www.hmcourts-service.gov.uk/HMCSCourtFinder/ will help you find the nearest court to you so it is worth phoning up and asking the process there. Some courts require 3 sets of the paperwork, some only one set. Others like Birmingham prefer them printed in duplex and hand written page numbers ( I gues they are green). Some courts you wil definately see a judge and others you are not likely to.
Let us know which court and I may be able to give you some more information.
You also need to check the value of your cars etc as it is easier to sort these out before the event - but take/ send copies of purchase invoices / sales receipt along with MOT & insurance to OR.
If your income is low you may get some help with the £485 fees, but I am guessing that Synergie have suggested that you pay £604 into the iVA so conceivable that you will pay a reasonable contribution (income payment agrement) to the OR for 3 years and are unlikely to get help with court fees.
Why don't you post your income & expenses on the site to get feedback of what your allowable expenses are, alternatively email it to a few of the experts to get a consensus. I suspect that you will pay something like £330 pm if you use your allowances.