New to GIS and to QGIS, so maybe this question is way off base. I imagined I would be able to draft lines, arcs, circles in QGIS for customizing maps, adding polygons and vector lines to indicate sites on a map. Is that possible in QGIS? So far I only seem to be able to work with data brought into the program. I've managed to put together a nice map from online vector maps, but now it's time to move onto the next step and customize the map. Where to start?