If the appeal is against the judgement and decree of the Civil Judge senior division then you can file an appel in the Dist, Court, if judgement and decree is of junior division appeal lies with senior division civil judge. Dist., court is appellate court.
You have to argue on the judgement passed by the lower court, you have to point out the mistakes done by the lower court/
YOu can also produce the documents with the permission of the court by filing an application to produce the same, it is your duty to show the reasonable grounds to produce the documents in the appeal., court can permit you or it may reject your application. YOu cannot lead tjhe evicence of the wittnesses in the appeal court.