If you are outside the UAE, you should first apply for an entry residence visa, and once they arrive, you have 30 days to apply for the residence stamp.
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Documents required include
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the typed application form,
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salary certificate,
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labour card,
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labour contract,
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attested marriage certificate,
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attested birth certificate of children,
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bank statement of three months,
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attested tenancy contract
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and Emirates ID.
The marriage certificate — in case the marriage has taken place in your home country — should be attested there by the relevant ministry, and finally stamped by the UAE embassy/consulate in that country. Then, it needs to be cross-attested by the relevant ministry in the UAE.
News Source:Here is How to get residence visa for your wife, children in UAE.