MicroWeb will try to automatically choose the most appropriate display mode on startup, but it is possible to manually select a video mode by using a command line switch
Check out the releases page which will include a pre-built binary. Also available are FreeDOS boot disk images for 360K and 720K floppies, which are configured to work with a NE2000 network adapter. These boot images can be used in an emulator such as PCem.
MicroWeb uses Michael Brutman's mTCP networking library for the network stack. You will need a DOS packet driver relevant to your network interface. You can read more about configuring DOS networking here
To build you will need the OpenWatcom 1.9 C++ compiler. Use OpenWatcom's wmake to build the makefile in the project/DOS folder