How do I program an fpga once it has been designed and layout is

Trying to design an FPGA from scratch, but not sure how this fpga
should be programmed. It is going to be a tile concept fpga with a LUT
SRAM architecture.

I have the resources to write VHDL/Verilog, netlist it and do the
layout(incl. routing), but how do I program this fpga? I guess this is
something I am not too clear about. Thanks folks