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I suggest using the pcl_converter tool that I have committed recently, it allows to convert between multiple formats easily:
Available formats types for SOURCE and DEST:
OBJ (Wavefront)
PCD (Point Cloud Library)
PLY (Polygon File Format)
STL (STereoLithography)
VTK (The Visualization Toolkit)
As for the creation of a mesh starting from a point cloud, this is not a conversion but rather a creation. The process of connecting points of a point cloud by faces is called triangulation, mesh reconstruction, meshing.
You will find more information in the PCL tutorials, greedy triangulation is a good start.