Hi, There are two main fpga manufacturers, Xilinx and Altera...Th documentation provided with their free development tools hav everything you need.A good start is to learn vhdl, then downloa xilinx ISE7 ,then read the VHDL techniques in XST(synthesis tool documentation ..then download a datasheet of the target devic (Spartan 3, Virtex,..etc) ..then write code and compile and see ho it's synthesized and how the resources are used..