Sleep training

So my daughter is now 14 months old now. She still gets up at night and then takes forever to go back to sleep. I feel bad about it because everytime I go to try and sleep train, she either gets sick or starts teething.......so I'm just wondering on how to go about this. Do I just put her in the crib for naps and bedtime and leave the room and check every 5-10 mins. What do I do if she's standing up? Do I lay her back down or what? I'm kinda at a loss on what to do. Any tips and advice would be helpful please.