I have really studied this subject and wish I had all the knowledge I do now when I had infants.
As far as how many hours, at under 12 mos of age most babies sleep at least 17 hours. Twelve of those at night, then two two hour naps and one shorter nap usually. The last nap will disappear as they get closer to a year. The closer to birth the more sleep, the closer to one year year the less sleep. So at under 2 mos old your baby will probably sleep about 18 hours a day. The better the daytime sleep, the better the night time sleep. Yes that really is true.
Sleep is when their neuron connections in the brain form. Better sleep makes a smarter kid! It's been proven with scientific studies. So, it's worth the effort to get the best sleep for all of us, but mostly for children and infants.
Here is the best method I have found for getting a child to sleep:
try using the Baby Whisperer's EASY method for a schedule, and the Happiest Baby on the Block 5 s's method. Those two combined will make cio not be a needed thing (at that age)
EASY - when the baby wakes up it Eats. After you feed it, then it has Activity - bouncy seat, tummy time, sitting up and playing with toys, swing, exersaucer, etc. When the baby gets fussy check the B's - boredom, butt or burp. If it's none of those then off to Sleep. Don't wait for the baby to do more than get the tiniest bit fussy, then see what is causing the fusses - if it's just that they needed their diaper change do that, but if it's not the activity is boring, the butt is dirty or they have to burp, then put them down. This may happen after as short as 45 minutes, don't freak, it really means they are tired.
Now, to get them to sleep use the 5 s's. Swaddle the baby, hold the baby on their side and sway as they suck on something (paci, your knuckle or their finger/thumb) and make a shush noise. This will calm your baby. When the baby is calm, but not asleep yet, keeping them swaddled lay them in the bed. I like to pat them instead of sway after a minute or two cause you can still pat after they are put down but you can't sway, so pat the baby and continue patting gradually decreasing it as you put them in the bed. Also continue the shushing as you put them down, again gradually getting quieter.
If you do these two you will find a well rested, easily managed baby in no time.