You've got a nice vintage bow there in that Grizzly. Not worth a lot of money because there are so many of them around, so you really need to be shooting it. Get those muscles used to pulling and holding full draw weight at anchor.
45 pounds is good for most any deer/feral pig size game. Some of the bigger hawgs, I think I'd want more punch. I've turned 350 pounders into barbeque with a 55 lb recurve.
There are lots of good deals on longbows on the various sites, in classifieds and on auctions. And there's the Samick Viper I recommended in a thread last week. I'm seeing more and more of them. They're definitely not custom class as for fit, finish and performance, but they are solid, dependable budget bows to get you into longbow shooting.
You can get wood arrows already matched, dipped and fletched, but expect to pay premium prices for them.
Actually, I would not recommend wood to someone just starting out with traditional. I'd go with aluminum or one of the carbon/glass composite arrows instead. Wood can be kinda tricky. You're going to be learning enough new tricks with a stickbow to keep you plenty busy without having to worry about your arrows.