help on building the robot

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Hi,

I think that ROS is exactly what you are looking for, but it will take you a while to implement all that you mentioned. Basically mostly of what you are planning to use will be implemented in ros to one of the robots I mention below, but you will be able to adapt the code.

Looking at your questions, you should start implementing some tutorials to understand how ros works http://www.ros.org/wiki/ (ROS wiki).

Here I attach some information that can be useful to you (you are not explaining what kind of robot are you going to build, so take a look and decide what ever you want to use).

Robots using ros: http://ros.org/wiki/Robots (Robots)

Navigation stack (mostly implemented to PR2 robot): http://www.ros.org/wiki/navigation (Navigation stack)

I strongly recommend you to go step by step (this will help you to post more specific questions).

I hope this will help you, and good luck.

Àngel.