Sungei road - stall free - you go there got empty space - you
can take, but later uncles there take pole and beat you up not my
problem.
Why you want to go there and sell things ? - there not worth - all
things sell dirty cheap , not worth the trouble, you may as well go
rent places like tanglin mall or china square to sell things.
Paypal . - you just go there to www.paypal.com to setup your
account.
1) you will need a email address.
2) for buying - you need a local bank account or credit card - to
pay.
for selling - you need a local bank account to transfer the funds
to so you can withdraw.
read up the charges for each transaction (%) and transfer fee for
transfer money to local bank.