Babies and Bassinets.

Diana • Married to the man of my freaking dreams.
Hubby and I always talked about waiting to have a baby but recently my hormones have been going crazy and I really want to start a family. 
(I'm 21 in May, hubby's 24 in October) 
Hubby and I talked about it and we agreed that we'd start trying in a few months, so that baby comes 2017 or later. 
I'm trying to do research to know the bare minimum of what this is going to cost before I get myself in too deep. 
I'm trying to be responsible but thinking about waiting until we're sure we can totally splurge on baby things makes me so depressed. I don't want to wait a few more years. 
(Getting to the point, finally!) 
We live in a 1 bedroom apartment with absolutely no room for a crib. 
My question is, how many months can a baby sleep in a bassinet before she needs a crib. 
Trying to make a responsible decision on when to start ttc based on how soon we'd be looking at needing to move into a bigger space. 
In addition to the bassinet question, if anyone has any advice based on what I've said, I'd love to hear it. 
Thanks mummas, I appreciate the help.