best way is to make file that has the start file in it with other commands and configs in it already and all you have to do is type ./startserver and your server is working...
Code:
cd /path/to/hlds
screen -A -m -d -L -S hlds ./hlds_run -game cstrike +ip IP-HERE +port PORT-HERE +maxplayers 12 +map de_dust2 -debug