PAB has exlained things fairly well, but I would suggest you list more details about your setup so we could help with specific recommendations, of which you'll get a ton.

We need to know the bow's peak weight, draw length, length of arrow you intend to shoot, release or fingers, etc.

What is important is that you pick an arrow "spined" well for your bow. You can use most arrow charts to get a close approximation. After that it's bow/ arrow tuning that results in good arrow flight.

And although I might get some arguements, unless you intend on hunting real soon I wouldn't get all hepped up on choosing and tuning for broadheads at this time of year. You have a lot to learn about tuning and shooting form and have all spring and summer to do it. Broadhead tuning can be quite tedius if your bow is not set up right and the more you understand about tuning in general the easier will be for broadheads. Keep it simple for now.