Can you tell me about usages of these sofware( 3D studio Max, Maya, Poser.....)

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I'm new to 3D and want to learn it soon. But I can't setup my mind which software should i learn first? Then which one? there's a lot of title in the market like 3d Studio max AutoCAD Maya lightwave Poser Bryce Which one should i learn first? And what's about the other software- should i learn them too( if i want to be a 3D designer/ Animator) Is there anything else I need to learn? One more thing, is there any programable script in 3D? Thank you. NB: I'm a webDeveloper(HTML, Javascript, CSS, PHP, MYSQL, Joomla)