Here re some starter CAD Block Libraries that you can use
Metric Blocks
Ellipse Metric (0.5 Radius).dwg (38.2 KB)
Slope Indicators (3D).dwg (39.6 KB)
Slope Indicators.dwg (39.4 KB)
Takeoff Blocks - Metric.dxf (52.9 KB)
US Feet Blocks
4 Point Anchor Plate.dwg (38.2 KB)
Ellipse US Foot (0.5 Radius).dwg (378.7 KB)
Takeoff Blocks.dxf (49 KB)