hercufles: I really want to play this franchise but im not very familiar with it, I own 4 to 7, has anyone got a suggestion wich one to start with? Wich I mean wich one is the easiest to start with to get familiar with the franchise. And if possible reckomanned a mod or enchantment what was made for that game.
That depends. The first three are very simple games and are useful in that they establish some of the backstory / ancient history for the rest of the series. Some of the things you encounter will resurface later in the series. (e.g. Lands of Danger & Dispair, Gem of Mondain, Great Earth Serpent, Ambrosia, etc) Having said that, they're really old games and haven't aged well at all. In terms of story they're somewhat disconnected from the rest of the series and each other. Garriot didn't really think in terms of continuity in those days and made a half-hearted attempt to connect the games in the manuals. Also, beginning the game can be a daunting task if you don't know where to start, especially U2 where it's really difficult not to die of starvation. But once you understand the mechanics of the game it goes much more quickly. I can usually finish U1 in about 1-2 hours, U2 in 2-4 hours, and U3 in a day.
U4 and all games that follow it (except U8) are set in Britannia. U4 begins your quest to become an Avatar and is therefore where the moral choice that defines the Ultima series really begins. U5 continues the story and extends upon the virtue philosophy by demonstrating how tyranny can result when you legislate morality, that is when virtue is forced upon you by law. But U4 (and U5 to a lesser extent) haven't exactly aged well either. They sport a user interface similar to U1-3 and the combat system can be somewhat tedious.
U6 & U7 (parts 1 & 2) have more usable interfaces and feel more like you're exploring a living world. Many will say that U7 is where Ultima hit its prime and I agree, but U6 is nearly as good. Both games have full character portraits, continuous worlds (no entering/exiting towns - just one big map), NPC schedules, simpler combat, and mouse-driven interfaces. If you choose to skip U4 & U5, you can technically learn all you need to know about the virtues from U6.
The later two games is when the series started to decline. U8 has some horrible jumping puzzles, click-oriented combat, unbalanced stats, exploding chests, a quirky magic system, and is essentially a cross between an RPG and a platformer - hence why some folks call it "Super Avatar Brothers". Despite that, it does have some redeeming qualities, particularly the atmosphere. The haunting music, the desolate landscape, the dying civilization, and the Guardian/Destroyer deception... Origin created world where you can truly feel the despair and loneliness emanating from this place. All the while, the occasional Guardian taunt reminds you that you're in fact being watched and are helpless to stop him from destroying Britannia.
And U9... well... it looks pretty. That's the only positive thing I can really say. Let's just say I choose to forget everything else about that game.
So, to summarize, if you want to experience the whole series chronologically, learn all the backstory and don't mind the archaic interface or grueling experience grind, start with U1. If you want to experience only the content that's relevant to the core of the series - Britannia & the virtues, start with U4. If you want to experience the series at it's prime, play U6 & U7. And despite its flaws, I don't recommend skipping U8. (U9 is another story.)