First of all I love the doctor earth line, specifically the amendments. However, i have never used the potting soil... Let me go read what is in it.
Ok, Man, it is expensive. If your wanting to go organic like I hope you are, then I would look into a bag of Fox farm Happy Frog. It is less then half the price. How many plants are you doing? If you want to veg such a short time another option would be Fox farm ocean forest, it has nutes ( nutrients already in it) that will feed your plants for 5-6 weeks. Happy frog only has nutes for 3 weeks then you would want to use flower boosting nutes.
If you want to go with Dr earth for 45 bucks a bag, just what I saw with one quick look, maybe they are cheaper where you live, then i am sure it is a good soil. I just don't know how long the nutes are good for.
Let us know how we can help. Green mojo for your first grow..nothing like it... Welcome to MP.