Moose,
I got into climbing and tree care last year. So far I've done ten removals for friends/family. All really good advice here so far, I've been reading and learning right along.
I bought Wesspur's Entry-Level Combo Kit (see here:
http://www.wesspur.com/climbing-kits/entry-level-combo-tree-climbing-kit.html ) and have been very happy with it. I made a few changes when I placed the order:
I got a better saddle (Ergovation Economy) than they have with the kit; a friend who's been climbing for thirty years told me to get the best saddle I could afford to be more comfortable. The Ergo has nice padding and is adjustable over a wide range, also a good amount of gear loops.
I switched the climbing rope to Arbormaster Bigfoot (
http://www.wesspur.com/items/bf15.html ) and am very happy with it. It works well with a Blake's Hitch and now with a VT and pulley.
They give a discount on hand saws and safety gear when you buy it at the same time as the kit and I took advantage of that. I got a Pacific Kevlar helmet, a dozen Atlas gloves (they give EXCELLENT grip on rope!!) and a Samurai HD handsaw.
I also got a rope for rigging (
http://www.wesspur.com/items/sb1215.html ), a block ( CMI 5/8 stainless steel) and port-a-wrap. I made the whoopie and loopie slings myself from Tenex TEC per instructions from Samson.
After buying a few more odds and ends this year I'm up to a little over $ 2,000 in gear, but I always think that it's better to buy the right stuff once instead of going for cheap and then upgrading later, especially where I'm putting my life on the line.
One item I would not be without is a GOOD FIRST AID KIT!!!! Also First Aid/ CPR training !!
Since you're in my neck of the woods you might want to look into the Trained Logger Certification that Cornell Coop. Ext. does in NY. It is geared more towards logging but there are plenty of CE courses that are of interest to arborists as well. I took one last year on invasive species management that was a real eye opener. The courses are not expensive and most times they buy lunch
. More info here:
http://www.newyorkloggertraining.org .
Good Luck and climb safe!!