"8mm"? "Starter gun"?
It's obvious that you know very little about pistols and pistol shooting.
I strongly suggest that, before you even attempt to buy a pistol, much less carry one, you take a class in which you will be taught the fundamentals of pistol safety, handling, and shooting.
You might ask about such a class at any nearby gun shop or shooting range. The concealed-pistol-licensing agency in your county might also be able to help.
There are gun shops and shooting ranges where pistols are rented by the hour. You might try as many of these as you can afford to rent and for which you have the funds to buy ammunition.
Look for comfort in your hand, and how well you can reach the gun's controls. Accuracy is not an issue because self-defense is not a high-accuracy application, and because you are a beginner who cannot be expected to place bullets well yet.
Do not be suckered-in by neat-looking little pistols in pretty colors. Small handguns are very difficult to shoot effectively and well. The smaller the gun, the more it's going to hurt your hand.
Beginners should start with full-size, full-weight pistols because the size and weight absorbs enough of the gun's recoil to make the shooting experience pleasant, and not a turn-off.
The 9mm "Luger" cartridge is the most popular nowadays, but I prefer to start students off with the .45 ACP instead. A full-size, all-steel, .45 ACP pistol is the easiest of all beginners' guns to control.
Another possible choice is a revolver in .38 Special, but it, too, should be all-steel and it should have at least a 4"-long barrel (and 5" is better). The revolver should also have a hand-filling grip (handle), maybe even made of rubber. (However, I suggest against the Taurus and Rossi brands, since their quality control is not consistent.)
The very best value for your money would be a used pistol, rather than a new one.