I am interested in the entire plan but for the time being only require photoshop and lightroom.
Can i upgrade later or would it be a separate license
It will be a different subscription/license. If you cancel an annual plan prematurely there is the possibility of a penalty fee of one half the remaining subscription fee, though exceptions are possible for switching to other plans. THis is something you would have to work out thru Adobe Support directly.
As Ned suggested, you should contact our support folks on this:
Please check that you are logged in to adobe with your adobeid and use this link to access support : Contact Customer Care . Scroll down and click on the blue bar that says, "Still need help?” Contact us."