Need help With ester's

[mckay1512]

I am creating esters but i am unaware of the quantitys that i need to use for the carbolic acid and the alcohol to create the following smells
i will be using test tubes so it wont need to be large quantaties but the ratio figure would be good.
Octyl Acetate-orange
or
propyl ethanoate-pear

If you are aware of any good websites that could assist me that would be great to!!!!
Thanks in Advance