When Supporting documents be send when e-filing I-539

[aksaravanan]

HI,
I have e-filed I-539 for visitor visa extension.
i have two questions,
when should i send the supporting documents?
should i wait until uscis asks for such document or can i go ahead send all supporting docuemtns(as per from this site) ?

one of the supporting documents mentioned in this site is proof of return ticket. currently i have original return airticket. i am thinking about changing return date only after extension visa request results comes in. should i send my original air ticket copies?

shoudl i also send affidivait (i-134) forms ?

thanks in advance.
AK