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you go in right direction when you already make post proc on your GPS data (Trimble, RTK or any kind of GPS) the next step would be export it to any of GIS software personally for me, I use arcgis, but this will be applicable with all GIS Software, in your case, QGIS in your GPS post proc software, you can export those data (point data) to popular GIS format such as .shp this format will be easily open in QGIS or ArcGIS, here we come the GIS part, after you open the data id GIS software, you can start to add another data, like point, line (road or river) and polygon, or edit the existing data. GIS using layer stack to combine different data , just like in cad, so if you familiar with CAD then you will find this pretty familiar for you. after you satisfied you can export it back to GPS using plugin or internal function of the software, in my case I use ArcGIS, Garmin and MxGPS plugin. If you dont have a budget to get paid software, QGIS would be the best option for you there are tons of QGIS tutorial, in youtube or ebook, like this : https://www.youtube.com/playlist?list=PLNCPalajQvg7wQvzf3fM8fOZ5lMKl86Q4 https://www.youtube.com/results?search_query=QGIS+gps good luck and happy learning, dont hesitate to share and ask question here, we happy to help you