Quote: "Hey is it possible to make a computer game which has like a long story line to it like "Final Fantasy 10"?"
Yes, if you have the time and patience.
Quote: "Also if i have the DarkMATTER does this mean i can create my own people and place them into the DarkBASIC Professional game?"
DarkMatter doesn't let you create your own people - it lets you use pre-designed ones...
Quote: "And 1 more thing, desigining with DBP, it isn't that hard to make games...is it?"
Depends on the game - Pong : Very easy - FFX - Very hard
Quote: "Also with the Texture Maker can i design like backgrounds to the game as i want them?"
Yes
Quote: "Also can i make a fromtpage on the game where you select New game options etc or not."
Yes, and you can even do end screens.