I going to buy a few starhub stocks.

i have account in SCB.

i don't know what to type in some fields when i buy the stock.

I type the following
What would you like to do: Buy
Exchange: SGX
stock code: CC3
Order quantity: 1000
Order type: limit (by default comes but i don't know the meaning)
Order price: i don't know what to type here. what is this? I put any amount it works. then how? how do i determine what price i type in? please help.

what is limit order?
what is order price?

Also,
I see another page showing this information:
lAst price : SGD 4.13
change : 0.01
Bid (size) : 4.12 (339,000)
Ask (size) : 4.13 (28,000)
Day's range : 4.14 - 4.13
volume: 1,463,000

What do above terms mean and how i make use of above information?