RE: heavy arrow for "beginner"
I think you are over-thinking your equipment WAAAYYYYY TOOOOOO
much.
What is your draw length and poundage. If you are a long draw and have it set at 60 pounds plus use any quality fixed blade broadhead and you will be fine.
If you have a short draw and low poundage(below 60) than you have to think a little more about about broadhead choice. Like going with a 2 blade cut on contact.
If I were you I would go with Carbon Express Terminator Hunters they will come in at about 350-370 gr without a head installed. Good balance of weight and stiff spine but still light enough to get reasonable speed.