Lights/Brush Guards/Noobie Questions

I'm new to this forum (obviously), so please forgive if this thread is in the wrong place. I wasn't entirely sure where to put at after perusing the forums for a good hour and a half. Well, onto the meat.

I have an '01 4wd Xtracab SR5 V6 5-speed that is completely stock but for some regular old BFG ATs and a bed topper. At the moment, I just use it to haul my crap between Texas and Wyoming, where I go to school. I do, however, do light offroading (wouldn't mind doing more ) every now and then, for both 'business' (dirt roads, fields, potentially mud while doing archaeological field work) and more frequently pleasure. At the moment, I'm looking into fog lights and perhaps more front end protection for my Taco. There's a lot of deer here in Wyoming (and other things to run into), and a brush guard deflecting a poor doe's head from the headlights and grill of a friend's Chevy left an impression on me. I also don't particularly want to drill holes in my bumber for light mounts. So, I suppose my question is what brands/types/etc. you fine people might recommend for someone who doesn't have the most money in the world but would like a little more there to protect his beloved Taco from more damage (just recently got it back from the body shop after a fun rollover on the freeway, danged ice).

After that, I also have a few noobie questions about the 4wd system on my truck. I always stop to shift into 4wd, as I wasn't sure if it was shift on the fly or not. Is this the correct procedure, or does it matter? Also, the safest top speed while in 4hi. The manual says 50, so I havn't gone above that, nor do I usually cruise for any length of time above 30. Are higher speeds safer for shorter durations, or is it a matter of increased wear/tear? Anyways, I'll leave it at that for now, thanks for the input.