There's a guy called Lazarus in Amnetkhan you know, near him there's another guy called "kerrick the smith", this guy got a machine and he told me that he can upgrade or built weapons etc but he says I dont have anything interesting, is there any interesting items for it? I finished all the levels of Watchers Keep and all areas, so??

one more, this one is a spoiler about aerie romance

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Through the end of the game, Aerie told me about marriage setting sun being together in peace and war blah blah is it the final of the romance or is there more to come?

Cant help with the Aerie Romance, but Kerrick the Smith uses the
SPOILER
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Golden Pantaloons, Silver Pantaloons and Bronze Pantalettes to make the

BIGGER SPOILER
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Big Metal Unit, Big Metal Rod and Ammo for the Big Metal Rod

The metal unit is the best armour in the game, makes you look like a greater golem.

The metal rod is a powerful missile weapon that comes with three different ammo type, all in infinite packages.

restate your question about aerie+you romance, I didn't quite catch that @_@

Where's these pants?

Hugh spoiler
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Golden Pantaloons in BG1
Silver Pantaloons in SoA
Bronze Pantalettes in ToB

Hugh spoiler
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In the end you can choose an evil or a good side. Good side = you'll live a happy life with Aerie and 2 children. Evil side = you become the god of murder and leave your love, Aerie behind with you son.