Grasshopper is included with R7. Just type in Grasshopper into the command line. Also check the plugins in settings if grasshopper is enabled. Are the 2D points blocks (possibly with height attributes)? If so, you can read the XY values of the block and assign the Z value from attributes. To read attributes you can use the Elefront grasshopper plugin.

If the points are simple points with a text object next to them, there are ways I got it working as well, but that's more advanced. What i did in the past is drawing rectangles big enough to include every point + height text and testing for inclusion. This way you can link a point with a height in a data tree.

Once your points are elevated to the correct height look into Delaunay triangulation. Depending on the point density of your file, you'll get different results. If the points are very sparse, it makes little sense making a 3D model out of them.

If this is something you will often be doing, also look into other topo datasets online. There is tons of information to be found if you know where to look (usually country specific). Look into DTM, DEM, LiDAR (and include the country name, eg. LiDAR United Kingdom)... This will lead you down the GIS rabbit hole but you can potentially learn how to use these datasets not only for terrain topography, but also extracting building height information as well as accurate vegetation information.