Question on Fundamentals of GTD - I am sure any GTD follower would get these...

[WintheWin]

Hi there,
I have few basic questions that arised when following the GTD methodology.

Background
I COLLECT mindsweep lists, ideas, etc... to my IN basket / file folder.
I PROCESS this IN basket often (about thrice a day) and ORGANIZE them into context based action lists.
If I find that an item from my IN basket requires more than one action item for its outcome, I would consider that as a project.

Questions
1) In order to find the next action for the project, I will have to do brain storming / project planning and list all the possible steps to accomplish the outcome.

I may not have time to do this during the processing (every time) , as it usually would be during lunch time, tea break, . How do I decide the NEXT ACTION then?

2) Most of the time I would know the next action for the item getting into my IN basket. David says "not to" get tempted to do that immediately. What is your opinion on this?

3) When at office, some of the action item obtained from the meeting will have to be done by end of day of the day. It might not even wait till my next "Executive Decision making" time. How to take those through the GTD process then?