Welcome and I applaud you for making the decision to gear up. I haven't always, but made the switch a couple of years ago.
Lots of good advice here, especially the helmet-fitting article. I, myself, wear a kind of hodgepodge of "dedicated" motorcycle gear and off-the-rack, Tractor Supply stuff.
I have a Fieldsheer jacket with pads and a removable liner, but my pants are just Carhartt heavy denim, double-front "fire hose type" pants that I wear over my jeans. They're probably not the best skid protection, but better than none and I like them.
I wear and like the AFX-39 helmet. Actually, I like it better than a $400 Shoei helmet that I used to have. It fits good and I like the visor: it's easy to flip up and down with gloves on, although with mine it's almost always up. The only thing I don't like about it is when it's cold and I have the visor down, it somewhat distorts the view of the road surface ahead of me. For example, a gravel road may look like it has a pretty good slope or crown to it when in fact it's perfectly flat. Still really like the helmet, though. Mine is black, but I think I might pick up a glossy white one if they offer one in that color.
For boots, I just wear the same Rocky "Wellington-Style" pull-on leather boots that I wear when mowing, working in the yard, etc. They work well for my type of riding, but probably don't offer enough ankle support for more serious off-roading.
My favorite gloves are a pair of basic, black deerskin "motorcycle gloves" that have a tad of insulation. They're not too heavy and not too light and are comfortable at all temperatures.
As noted in previous posts, it's just what you prefer. Hopefully you're lucky enough to live somewhere with stores that carry this stuff. I don't. It's either mail-order or the local farm supply store for me. Most online stores these days have pretty liberal return policies. If you buy something and it doesn't work for you, a lot of them will send you a pre-printed, free return label to exchange it for something else.
Basically, in my opinion, you can buy really nice gear that works well, but if you're not comfortable in it, it won't work for you. The good thing is, once you find a nice setup, it will last for years barring any accidents. You can pretty much trust your common sense to choose what's going to protect you if you go sliding down the road.
Although they are for some, style and looks are not a factor for me. I look like a cross between Darth Vader and The Michelin Man when I'm adorned in all my gear, but I don't care. I even have one of those stupid yellow mohawk things velcroed to my helmet. It makes people notice me, which is good.
I got my Fieldsheer jacket just because it was dirt cheap, available in black only, but when I decide to replace it, I'm going Hi-Viz. In the meantime, when I'm going to be riding in urban areas, I have one of those lime green safety vests I put over it to stand out more.
In closing, my personal recommendation is an often-overlooked one, but one I feel falls into the safety category: a set of good earplugs. Some may disagree that they're unnecessary and perhaps a detriment to hearing what's going on around you, but I feel the benefits outweigh the disadvantages.
I like the hear the KLR sing as much as anybody, but that noise will eventually take a toll on your hearing. I find my KLR much more pleasant to ride and it seems like I can ride further, more comfortably, with a set of earplugs in.
Get back with us and let us know how you geared yourself up.