Hi izzeybell.
Not fully sure on the court papers you have received or of your position regarding your CCJ from the info you have supplied.
If you are requesting redetermination you may need to submit an N244 not an N245, please note there are a number of issues surrounding determination & applying for redetermination, for example was the original determination made by a court officer or a District Judge, was there a hearing?
Taking the above into account my advice would be that you visit your local CAB or Advice Agency taking all your court letters/papers and any other relevant info, they should be able advise and help you with the correct procedure. Alternatively you could telephone one of the free advice agencies such as CCCS, having all your papers and other info ready when you make your call (also have a pen & paper ready) and again they should advise you on the right procedure (make sure these are done within the time limits)
Any of the above agencies should also be able to give you advice on Charging Orders if this is applicable to you.
If applicable the N244 court forms should be available to download off the court website already mentioned or you should be able to obtain one from your local advice agency or county court (there may be no court fee payable here in some circumstances)
Hope this helps.
Pincer.