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Hi!

Can you please help me choose better options and see if the rest of the sentence is OK.

In a collaborative or win-win approach to negotiations, the preparations will include a number of seemingly side issues such as determining the place/meeting point/location of negotiation, (determining) the equal number of members of negotiation/negotiating team, provisions for ambiance/atmosphere, arrangement/disposition of negotiators, food and breaks/intermissions/pauses; all this for the purposes of creating more stimulating and more comfortable atmosphere/ambiance for all the parties involved/for all parties involved.

Thank you and sorry for bothering you with such a long sentence.
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Nobody has volunteered yet so let me give it my best shot...

'preparations' : why plural ? shouldn't it be singular if referring to the process of preparing something ?

'place/location/meeting point' : I can't make up my mind here ; also '... of negotiation' or '... for negotiating' can't decide either...

'determining the equal...' : might want to say 'assessing' so that you don't repeat 'determining' twice. Don't understand 'equal number'. I would simply say 'the right number'. Unless you want to emphasize the fact that both parties should have a team the same size (same number of participants).
Also I would say 'in negotiating teams'.

', provisions for... ' : need the '-ing' form here as well, since you've started this way, so 'providing for' or 'making provisions for' ; but doesn't sound right that you'd provide an 'ambiance/astmosphere'... how about 'facilitating with regards to atmosphere and disposition of negotiators (around the table)'.

'break/.../pauses' : really don't know which one to pick...

'... for the purposes of creating more' : drop the 's' for 'purposes' as it should be singular ; add the indefinite article after 'creating' = 'creating a more...'.

'atmosphere/ambiance' : don't know.

'all parties/all the parties' : I think both are correct.
Comments  
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In a collaborative or win-win approach to negotiations, the preparations will include a number of seemingly side issues such as location for negotiation, the equal number of members for each negotiating team, provisions for meeting room's setting and ambiance, seating chart, food catering and intermissions; all this for the purposes of creating a more stimulating and comfortable atmosphere for all the parties involved.
Not that it will add anything to what mister hbae787 put together... But just to mention the expression 'seating arrangements' which I came across yesterday night while reading a book... And which made me think of your text, miss Antonia...
Thank you both for your comments and suggestions! I combined your suggestions and I think it's Ok now.
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