Have some problems in the usage of will/would

[Samizmr]

Hi,
i just joined this website,i've had this problem with the usage of will/would for sometime now ,could anyone please help me?
look,i know that 'would' is used as the past form of will,
i've interpreted from movies that would may also be used instead of will if the result is impossible or if thr action/state wont happen like:
i would never go there.
why would i do that?
1st question:is this correct?
2nd:should i use 'will' only for the actions that will happen in future?or can i use would too?
Many thanks in advance.
sam

[Samizmr]

I forgot to ask,can i use would for requests too?