need help going to trial

[snow45]

I had answered a summons recieved on debt of $1300. I sent answer to summons to plantiff's attorney certified mail but didn't certify copy sent to court. I recieve a letter saying I defaulted because I didn't response to the court. I call them and they say it must either be lost at courthouse or lost in the mail. I then fax them a copy yesterday and I call today and am told Judge set aside default judgement and I will be going to trial. Now what do I do to prepare for court date? This all new to me. I asked to see a copy of credit card agreement and assignment to JDB and to have affidavit struck from record as hearsay(assignment from OC to JDB). I fell like I have won a small battle and now need to win the war. Thank you!