Before I can answer that, I'd need to know a couple things. Bottle feeding or nursing? Family bed or crib? Near your bedroom or in your bedroom?
that said, I have 4 kids, I've taken them through infancy every way I just described. What I'm not really certain of, is what sleep training is. If you mean trying to get them to sleep through the night, or if you mean getting them on a schedule to waken and go to bed. If you plan to send your child to school, it's better to have your child on a schedule that will ease his biological clock into sync with his daily life. Depending upon whether you begin schooling outside the home, that's something you can gradually transition toward over the course of several month... I've done it over just a couple months. So really, you should get your child on a bedtime routine that gives you and your husband some alone time at night. Whatever you do, don't get in the habit of keeping a toddler up until 9 or 10 and sleeping until 9am.... you will never see your husband alone! lol It's just not good for your relationship. I still send my 9yos to bed at 8:30. He gets up at 6am w/o urging. Whereas my 7 3/4yod is a night owl. They go to bed at the same time, but she struggles to turn her brain off, just like me and is never ready to wake up in the morning.
The more important training.... is to make sure you get your child's bowel movements scheduled first thing in the morning. An OLD ped told me that with my first child. He said that it has a huge impact on their ability to cope in school.. I'd have to say it was the best advice I ever received from a doc.
Finally, until a child is nearly one year, or can communicate by simple ASL sign language, I was always raised to respond to their needs when they cry. Infants cry when something is wrong. If they are confident that you will respond to their cries, they will be happy, well-adjusted children. Like my mom always told me-- you can't spoil a baby. So pick her/him up, carry him around to sleep in a sling, don't keep the house quiet and savor every day, it's gone all too soon. BTW my kids are 7, 9, 20, 25. I homeschool the younger 2 and they both learned to sign at about 12 months and that made a huge difference in the Terrible Two stage... never had them!