you need to install the normal simutrans somewhere. "/home/sim/server" Then unpack the source somewhere else "/home/sim/src" compile simutrans for posix.
cd /home/sim/server
../src/build/sim -use_workdir -server ... -load savexzy.sve&
Simutrans expect the pak files, translations etc. in the current directory. If nothing is given, it will assume the program directory. To use the current directory, use the commandline option "-use_workdir"
You do not need to specify a pak when starting the server from a file. Once started, you can even reload the last saved game after a crash by just specifying "-server" on the commandline.
If you run more than one server (using different ports) then you need to specify announcement name etc. un the commandline, otherwise you can also edit the simuconf.tab in the directory with the pak files.