Hey guys, after recommendations I bought the above bow for my 10 yr old son. It's for Christmas and still wrapped.  I was only able to see the shafts of the arrows so I don't know what kind of points actually come with it if any at all.  
   Is it standard to always have to buy your own arrow points? And are they all interchangeable or are there different attachment methods? ( mlok vs picatinny for example).

The field points, which is what a child's bow would use, come in a variety of weights so they are usually purchased separately based on what a particular bow needs.  Inexpensive children's bows often come with cheap arrows that have non- removable points on them but I would be surprised if PSE does that.  Your best bet would be to take the bow to an archery shop and see what they recommend based on the arrow types, length, draw weight, etc.  I have no experience with such a low draw weight so I don't know what to recommend for you.