No Problem, let me give you a quick crash course
KV means the rpm per volt, a higher KV motor is not better or worse than a low KV motor they just serve different purposes.
Amps in a motor increase torque in a motor.
Small racing quads use high kv motors because they produce lots of rpm for instance a 4S 14.4v battery on a 1200kv would produce 14.4*1200=17,280 rpm at a high current draw. (your quad would go quite fast). However, you have to use small props because as you could imagine these props do not have very high torque. Which is why they need to pull a lot of amps to make up for the little torque they have. Which means they need to spin smaller propellers and can not carry as much weight either.
Low KV motors have more windings. In an electromagnet more windings means stronger magnetic fields. Thus the voltage is used to induce a stronger magnetic field in low KV motors, which means low KV motors have more torque. However, they have much lower RPM’s. As a result of this since they have more torque by default this means they don’t need as many amps, which generally means higher efficiency. Also, since low KV motors have more torque and lower RPM’s they need and take advantage of large props. They need lots of blade surface are to make up for the much lower RPM. This also means that because they use larger props they generate more thrust at lower amps and are capable of achieving longer flight times and/or carrying heavier loads.
With this said
300kv*11.1=3,330 at a very high current, as you can see this is a very low rpm
The reason why it would not work is because a 300kv motor generally needs to be run on a 16-17in prop with a 4S battery.
You could try to put a 13in prop on the 300kv motor with 6s
300kv*22.2=6,660 but this is really not optimal and puts a lot of strain on your motor. Since this isn’t really a proper setup.
So it all depends on what you want to use. You could definitely get 30min flight times with 13in props. Thought, for a 650mm frame 15in props would definitely be more appropriate for the weight you want to pull and help to provide you longer flight times.
On the contrary if you want to stick with 13in props your going to want about a 5000mah lipo a 10,000mah is probably going to get a bit heavy for your setup.
If you can give me a bit more of an idea on what exactly you want to do I can help. Are you looking for long flight times? How long? Do you want to carry just a GoPro or heavier cameras as well? Do you want a gimbal on your camera? All this needs to be taken into account
Let me know if anything is unclear to you, as I know I gave you a lot of information! I remember when I was just starting like you a year ago and it is great to see your enthusiasm! I will help you as much as I can to get you where you want to be.
I am also working on a website that will talk about my projects (my first project I will be posting is my long flight time quadcopter) So maybe you can head over and check that out once my website is up and learn a few more things! 
