So how wil i know when to pull the sack?? its been 24days today??

Ok, does she all ready have a egg case?
Has it been 24days from the day she laid her egg case or 24 days since you mated her?
So what has the temps and humidity been kept at?

It is a risk, this species is known to eat there egg sacks, so you can iether risk it and trust that the mother is going to keep looking after the egg sack and not eat it.
Also if there are bad eggs in the sack this will cause the rest to go off and die, so that is another thing you need to bear in mind.
This is where it comes down to you and what you wont to do!

You can leave the egg sack with mommy and she will keep looking after it until the slings emerge.
Or
you can pull the egg sack, but then you are going to have to take care of them, until they reach 1^st instr.
which is not hard!

Temp. is 29 and the humidity is perfect......if i take the sack away what do i do then?? temp??tank?? and ow long do thay stay in there?

I'm going to say and advice you, leave the egg sack with the female.
Until you have done some research and are good and ready to take the egg sack away from the mommy and open it up.

I'm going to give you some links you need to go through and just do some research on building an incubator.
Incubator

New Incubator Tutorial!!

Thank you Cascade!

The little ones look amazing!

Wow so awsome to be a dad of +- 180 little ones......all thanx to one man....thanx jake A.K.A cascade..