Airsoft isn't about being the fastest guy on the field, a guy with 99and1 kill ratio, or a being the dude with 1000's of dollars worth of guns and equipment on the field. It's all about having fun shooting other dudes who want to shoot you.
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I would definitely recommend a sidearm. As you may think it is impractical, sometimes (atleast in CQB) you will want to work your way around those corners better without lowering your gun which leaves you incredibly vulnerable.
As to which pistol to get, some may recommend a cheap clone gbb. BUt if you know you like airsoft, and you won't be quitting anytime soon, work up the money for a kwa or tokyo marui. If you want something a lot cheaper, but reliable, my personal suggestion would be the hfc m92 vertec also known as the m190 special force. It is a clone pistol, and is pretty ugly IMO, with it's gray metallic body. But I have had it for a year and a half, and not had one problem with it. Reliability wise surpasses a WE 1911. Sorry for the long post, but good luck on your sidearm, lots of fun to plink around with.