How to date a co-worker:
1- make certain that the co-worker you date is not from the same department.
2- make certain that dating a co-worker is not in conflict with the work etiquette of your place of work.
3- be descreet: first because you don't want to evoke bad comments and second you don't want to evoke jelousy (worse than the bad comments)
4-be respectful as with everybody else
5-make sure ahead of time it's a good idea because if it does not go well and your choice was not an appropriate one, you may find it difficult to continue working there. Good Luck