Got a product board, but dont know how-newbie

Sound like an interesting board.

But hacking a softcore FPGA is more difficult than it was on a hard chip. You will need at least a PTF, (about hardware resources, for memory and io port address etc) of the 1C6 to build uClinux.

There should be some JTAG header or contact points to program the flash.

The current Nios2 is MMUless, it may be difficult to run real X server and LTSP. But there is NanoX, and a VNC server ported to it. I think the Windows terminal use RDP.

I don't know if anyone added PXE to Nios2, but you may try u-boot to remote boot the kernel.