Me giving you my opinion, based on my experience, isn't advice, it's information, taken or left.
Advice is me telling you my opinion and exactly what to do, see my advice isn't worthless nor free, and if I tell you what to do, then I personally am putting my reputation and word on the line as such my advice is valuable, if I tell you what to do it is going to work.
This isn't any kind of directive, sure there is my personal experience, but that is all it is. Same when it comes to any topic. Someone wants my advice they better be paying me a premium or I love and care about them like family
This OT is someone asking what they should do, I am simply giving my opinion, frankly as much as I know about the OP or anybody here, none here would want or use my advice.
Personally I have been on both sides of this, I have been shot and shot at, I have also been shooting and shot another human being. I take guns very very seriously, because I know what they can do, and I felt it.
A cheap anything comes with the understanding of what it is you are paying for. Nothing is free, there is always a trade some where. In my experience you buy cheap Semi Autos jamming and misfires can happen a lot.
However NO firearm even the best and brand new if you don't clean and maintain is going to work without problems.
Glocks previous generations are great because you can do so much, break them down, take them apart, get familiar with what you may need to replace or calibrate. However if you buy something cheap, you might not know what state you are buying, unless it's brand new, and even then it's going to be more expensive vs something previously owned.
I am going to train and help teach my fiance this Fall for example, I would start her off with a revolver, something good and solid, something she is mostly comfortable with shooting and caring, and target practicing with.
I also have some of my other guns I will move her up to, but I wouldn't do any of that until she has the right mindset, developed muscle memory, became used to it like a 2nd nature.
If it was my son or daughter, because of age and lack of experience, this is the same thing, the only difference is with my fiance she can advance sooner vs say a teenager.
There are also some physiological things I feel are personally important also. A gun is to kill a human being period, and guns aren't toys or for flash, and if you pull one or use it you shoot to kill.
The reason that is also important has to do with not only the kind of firearm Revolver vs Semi Auto, but if you have as much experience you know damn well aiming is a lot harder than on TV and movies, PEOPLE MISS A LOT. I would even say people mostly miss especially when they have no training.
However if a bullet enters your body it's going to kill, some sooner than others say less medical intervention or something else.
So yeah a Revolver is going to be your best for beginning IN MY OPINION, size weight etc that is going to be important. If you are going to commit take it seriously, and get comfortable with it.
Nothing also worse than someone with a conceal carry permit who could have saved themselves, that didn't do any of the above what I said, and got themselves killed, or had an accident.
Again my opinion, others do things differently.