My experience having shot, smithed, tuned, and setup bows for over 20 years is that over half of the folks shooting bows out there are not properly tuned*. Without a proper tune, you will always be chasing accuracy and your setup will be very unforgiving. Starting out with a properly setup bow is the foundation for all good archery. Take the advice and get your bow setup by a true professional. I would also be willing to wait on arrows until you take your bow to be setup by a pro. It is a spit in the eye of a pro shop to bring to them a sack of mismatched goods and ask them to put it together and make it work all in the name of saving 10% buying off the internet. Whatever little bit more you pay getting your gear from a real shop will come back to you in spades with a properly tuned and setup bow.
Also, you have a gift in that you've never had a chance to develop poor shooting form so don't waste it! I recommend the John Dudley youtube series on shot execution. Learn from the start how to push/pull a surprise release and you will be outshooting all of us trigger punchers this time next year.
Also for the love of all things Holy, DO NOT swap broadheads midseason so you can shoot something more species specific. Find a good head and stick with it and then buy extras before those jokers discontinue it and introduce an "improved" version of it two years from now to boost sales. I'm not in the anti-mechanical camp like some guys on here are. They fly very well, are easier to tune, do not broadhead plane as bad a many fixed blades, offer better cutting diameters, etc. However, I agree for the most part that a good solid fixed blade is preferable for species like elk. I have had good luck tuning QAD Exodus heads and am currently playing around with some of the single bevel two blades out there, but don't have enough data/experience yet to recommend them.
*Tuning is a dynamic thing that includes the shooter and every part of the bow and arrow setup. Trusting a bunch of folks on the forum to piece that together for an accurate setup is a like having someone field dress their first deer blindfolded while listening to a podcast on how to field dress deer. A bow is a massive tuning fork and everything you add or subtract from it will change the dynamics. I'm amazed at the guys who practice without a quiver all summer then can't fathom how they missed that elk at 40 yards with six arrows and broadheads hanging at on the side of their bow during hunting season.