Some god points. Matthews is a solid choice, so are many bows from Hoyt (My personal favorite) Weight isn't the biggest issue. Kinetic energy is a more important number. Your arrow weight, and speed are how that info is achieved. My bow is at 77 pounds, I have a 32" draw, and my bow shoots my hunting arrows at a real chronographed 327 feet per second. I have a tone of kinetic energy. I had a passthrough on a rather large moose at 48 yards.
Practice is huge! The bow is the foundation. Get a solid bow, (Hoyt, Matthews, PSE etc your choice) Add a top drop away rest, top sites, quality arrows, and if you intend, a trigger release. If this is a passion for you, don't skip. Buy the best you can afford. PM me if you like.