In your context, a handgun is going to be the most versatile defense tool to start working on right away - it can be stored closest to you in the home, and after some classes you can evaluate if it makes sense to start carrying it with you everywhere.
Long guns will be a great addition down the road, but for now, the NRA Basic Pistol is the place to start looking, and acquiring an affordable reliable pistol (G19 is certainly not a bad suggestion - something of similar price and quality will also do) and mostly the purchasing of magazines and ammunition to get good at shooting that platform before you start dividing resources between multiple weapon systems.
عندما تصبح الأسلحة محظورة, قد يملكون حظرون عندهم فقط
کله چی سلاح منع شوی دی، یوازي غلوونکۍ یی به درلود
Semper Fi
"Being able to do the basics, on demand, takes practice. " - Sinister
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