The gun new went for about $299.
380 auto. Many good brands of ammo out there.
100-20000 USD depending on EXACTLY what you have, condition, history, accessories, finish, box, papers, etc..
Try want ads, gun shows, gun shops.
Russian made
2mm in case length.
100-1000 depending on exactly what you want/have.
You don't define what "better" means to you. Price? Size?
You can purchase a new gun for around 380 dollars. Your gun is worth about 250 dollars in the used market.
Near the firing pin
25-75 USD
$75-$125, depending on model and condition.