County Court Hearing

Tenancy Types and Management

I had a court hearing yesterday. My tenants did not turn up (they said they thought the hearing was tomorrow.) On Sunday they will owe me £2,500. I had copies of my correspondence with them-but stupidly I didn't have a copy of my Section 8 notice so my case was thrown out.
A checklist of what you need to take to court would be helpful.My mistake will probably cost me at least another £1,000 pounds in more lost rent and the court fee.
My tenants want me to go to the property weekly to collect the rent. They also want to pay £30 each week towards the outstanding amount. Do I have to accept these terms from them? They have suggested doing this before but never stuck to the arrangement. I'm afraid if I accept this it will jeopardise their eviction.
I only use an agent to find tenants and I'm sorting this on my own and it's a steep learning curve!Any suggestions would be welcome. Thankyou.
P.S. I gave them another section 8 last night and I presume I can go ahead immediately and send off a 21b without further ado?