Anyone interested in online futures trading? Pm me for the rate!

Bros, Sis & Sifus,
any good books to recommend for KLCI Index Futures trading, for a greenhorn in KLCI Index Futures but experience "longing" stocks?

FYI - the reason i'm getting into KLCI Index Futures is for "shorting" but somehow, i still cant get the gist and calculations
eg.
4 types of contracts we can long or short
a. Current month aka Spot (right?)
b. Next Month
c. 3 months
d. 6 months

IF say KLCi is now 100 and i expect it to go down to 80 in 3 months
I'd SELL 1 or more
3 MONTHS contracts
for say 90 ie. above 80 and my target profit of 10 per contract?

OR

I'd BUY 1 or more
3 MONTHS contracts
for say 70 ie. below 80 and my target profit of 10 per contract?

OR totally something else?
My apologies for my blurness - just getting started and no books to refer to. Thanks in advance to all sifus and kind souls in leading me out of the fog
BTW, i've signed signed up for Hong Leong's KLCI Futures platform - looks a bit alien to me but i heard that it can to trailing stop losses and stuff which normal stocks platform dont have (in MY lar).