I believe you are referring to the tie rod ends.

yes they can spin. The trick is to put some pressure on the tie rod so the tapered section seats tight in the knuckle or pitman man. That will stop the rotation.
As for boots, if you are using a brand like Moog or similar, it is usually possible to find replacement boots online. Try to avoid using a pickle fork for removal, they tend to destroy boots. A proper ball joint tool works much better.

Cummins R2.8 diesel, ZF5, AtlasII, HP44/BB9, ARBs, coiled / linked suspension, 37" KO2s, full cage, bumpers, etc.
Build Thread:
http://www.coloradoclassicbroncos.com/viewtopic.php?f=3&t=5420Average 23.5 mpg, Best tank: 25.1 mpg