Re: Scary moment
Seems that your jeep didn´t see preventive maintenance for some time, seeing the list of items.
The glow plugs are used during starting and maybe during the warmup, but for the rest they are not needed for the operation of the engine. If the engine still starts without problems, i would leave those plugs for later.
Play in steering and/or suspension parts can have dangerous effects on the stability of the jeep. This normally you only will find out during more extreem situations in the beginning, which makes it all even worse. So i would put those in the first place.
The prop shaft CV joint boot (its the one on the T-case?) depends on how the joint is. If the boot rupture is recent and still some grease is inside the joint (and not much dirt), you could just change the boot, but should do that as soon as possible, to prevent premature wear of the joint due to lack of grease and the presence of sand/dust in the joint. If it is completely dry and dirt present or play on the joint, then it will be better to replace the whole joint with boot.