it's up to you and your eligibility to either to bring them on family visit visa (6 months) or Family/RP visa. If you are eligible, bring them on Family/RP Visa right away, no need 6 months visit visa.
I am not sure about Phils, but here to apply you need their passport copies, copy of your marriage certificate, copy of your kid(s)' Birth certificate(s) -/sometimes these documents must be attested, not always though/- , NOC letter from your sponsor, bank statements. to be eligible to sponsor your family, you have to meet certain requirements (position, salary, etc.)
Make Search on QL and you will find a lot of info on this subject