Create Drawings for Small Building

We have built a small building 8' W x 20' L with 8' Side Walls and a Gable Roof. We used structural metal studs. We attached OSB and LP Smart Siding on the Outside and we attached 1/2" PVC paneling on the Inside. We covered the roof with OSB and Metal Roofing. We have hand made drawings. We need to convert these drawings into computer drawings. We also need load calculations for this small building.