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draw many objects

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I've finished some basic tutorials abaout opengl.
For me, the next step is creating my first simple game engine. I have a question about performance on drawing multiple objects.

I want to have some objects moving independently one from each other. (with its rotation, translation, etc..)
- Should I have a model for each object I have in my world?
- Should I only save the total angel rotation for each axis, the translation lenght for each axis...?
- Is there a way to speed up the loadIdentity, glrotate,.. pipeline?

sorry for this newbies questions but I am a little bit confused.

and thanks!!

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