For varmint / pest why don't you look at the cheapest .22LR rifle you can find at your local gun/pawn dealer? An old bolt action for about $80-$100 would be perfect. It will be WAY more accurate and have better ballistics.
For conceal carry, I'd look at something a bit more substantial in caliber, at least .380.
If you are not a gun guy, picking a revolver is a good choice.
The Ruger LCR and Smith & Wesson are WAY better revolvers than anything from Charter, and with the cheaper models being perhaps only $50 more expensive. This really is a case of save a bit more now, and have a much better gun later (IE, FOR THE REST OF YOUR LIFE). When you realize that you will have this thing for the rest of your life, whats an additional $50 or $100 paid to a get a much better quality item now? Depending how old you are, cost averaged over your lifetime that could be just a few dollars a year difference.
https://www.budsgunshop.com/catalog/product_info.php/products_id/58567/Ruger+5401+LCR+5RD+38SP+%2BP+1.87
https://www.budsgunshop.com/catalog/product_info.php/cPath/2084_2108/products_id/70712/S%26W+M442+5RD+38SP+%2BP+1.87+w%2Fo+Internal+Lock
https://www.budsgunshop.com/catalog/product_info.php/cPath/2084_2108/products_id/415003338/S%26W+M%26P+BODYGUARD+38+NO+LASER
If you are REALLY stuck on a .22LR revolver, look hard at the Ruger model 5410 and 5435. really cool lightweight 8 shot revolvers.
For conceal carry, be careful to compare weights. A 15 ounce gun is much easier to deal with than a 21-25 ounce gun.
And if you are looking at .22LR pistols, don't forget to look at the Ruger Mark IV, Smith & Wesson SW22 Victory, or Browning Buck Mark. These style pistols are legendary for a reason. Accurate, low recoil, durable.