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I would say:
Cogita antequam agis. (if addressed to one person)
Cogitate antequam agitis. (if addressed to more than one person)

Thank u.... is actually for a tattoo that is gonna be placed on my wrist. Do u think that is the best way and more proper way to put it.....???

As usual, George is right.

This quote is the motto of a freemasons' order of Spain: ORDEN DE LOS CABALLEROS MASONES CRISTIANOS.

You can complicate it by saying: Ante cogita quam aliquid facias.

Not sure what you mean. Are you asking whether to use the singular or plural?
Or are you asking about the physical placement?

Yeah if it should be singular or plural??? And what does that other stuff means that the other guy wrote....??? Again thank u very much for ur help

In this case, I'd go with the singular.

Francis is saying that this phrase is also the motto of a group of Freemasons in
Spain who call themselves "ORDEN DE LOS CABALLEROS MASONES
CRISTIANOS" (that's Spanish).

He suggests an alternate translation: of your phrase:
"Ante cogita quam aliquid facias" (that's Latin).

Thank u again Mr.George but what does it actually means??? what frances said... or wrote, i know who the masones are because i am spanish myself my question is what does it mean and if it differs from your translation, because he said i could complicate by saying that.. what i wanna know is what does it mean?? and how accurate it is? Thank to the both of u...

OK, let's break it down.

Ante cogita quam aliquid facias

Ante...quam -> Before (sometimes the two parts of antequam are separated by another word.)
cogita -> think
aliquid -> something
facias -> you do (or you make)

Cogita antequam agis

Cogita -> Think
antequam -> before
agis -> you act (or you do)

one more question.. b4 i get my tattoo done. why facias and not facio????? Again thank u for ur quick reply...

"facio" is "I do"