T568A or T568B?
Which one (1, 2, or 3)?
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If this is residential cabling, it is off-topic here, but you should familiarize yourself with ANSI/TIA/EIA-570-B Residential Telecommunications Infrastructure Standard.
If this is commercial cabling, the usual is T568B, but either could be used, as long as all cabling is done the same. The standard calls for straight-through cabling from end-to-end on a cable run for UTP cabling (fiber is crossed-over). All crossover or rollover, splitting, etc. must be done outside of the WAO (Work Area Outlet).