Got a few questions before I start mining, if anyone would be so kind

How long does it usually take to mine the litecoins and what kind of set up do I need, and will it(mining) effect performance of other things bad? 

 

I have a 2500k @4.5ghz and a 7950 @ 1100mhz-core/1400mhz-vram.  Would that be able to do it? I know its old tech but it still works for gaming for me, and speaking of gaming will I need to like close the mining software while I game to keep it from killing my fps or does it like go to the background. 

 

I spend most of the time its on not using it so I have some time to mine.

join this pool and start mining there http://wemineltc.com/. with the current prices you could be making around $4-5 a day in the pool. 7950 are the best cards for the job because best mining performance to power consumption ratio.