Google Analytics for Domain and SubDomain

Hi guys,

I am trying to make more sense of the google analytics data of our startup. We have our main website on mywebsite.com and our blog on blog.mywebsite.com.

I was wondering whether these two should be across two different properties on Google analytics (different tracking code) or the same one (same code). In the latter, I am assuming that we would need to use different views (with filters) to adjudge the traffic only on the blog.

My basic objective is to be able to track the journey of users across our website (mywebsite and blog.website). It will allow me to improve customer capture or so I have heard. I am happy if someone can point me to a good blog as well to understand this - I have read too many and have only ended up confused.