Best time to ttc?

So here's the deal. I'm 21 and my husband is 26. We graduate next December with our degrees (bachelor). I'm going to be a teacher and him a cop. But I don't want to teach for a while because I have an amazing PT after school teaching job and I love it. We're planning on buying a house after we graduate in December 2016. We wanted to ttc that same month. 
Should we wait longer to ttc and buy a house? Is it important to have a house for a baby or would an apartment be ok?
Thank you.