If you're just starting out I wouldn't get a secondary right off the bat.
Keep the money for something else (eg. mags, gear, boots, goggles), that is unless you have money in your pocket that you're able to specifically burn on a secondary.
Also are you getting a AEP or GBB Glock 18? I believe the general consensus is to stay away from AEP's. Also the full auto thing will wear down your parts faster than normal but it's just a matter of upgrades to better parts or replacing it right off the bat when you get it.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE