all muscle is "lean"... Thats like saying you need to go to the ATM machine lol
This is the big item right here^^ Post your diet and you'll get tips/critiques on it.
Yes it is possible. Like i said above your diet is going to be the big issue here. You need to get your diet in order ASAP.
as far as the cardio goes I would add it in after your lifting. You can switch it up between steady state stuff (like the stairclimber or incline treadmill walking) or some HIIT (high intensity interval training... Like riding a bike for 20 seconds sprint, 40 seconds recovery. Something like that) or my personal favorite of sprints. They are awesome and hill sprints are gettin a lot of love these days (except for when you're doing them. they suck)
So that would be my suggestions for you. Good luck OP