If i do this whit Martin, is that the end of game?

or can i go on whit all the other quest ,i dont have finish?

The game itself never really ends. You can go on with all the other quests afterward.

Yup, just like Anois said! You can continue playing even after completing the main quest!! That's one of the good things 'bout the Elder Scroll's games!!

and there are lodes of them not just guilds but also there is an invisible town quest the a painting quest to name just a few.oh and of course the dadric shrine quests