Sas on my 1990 4x4 blazer
 

Anyone have any helpful information on how much this may cost, how long it may take, which axles i should use, things like these???

Check out the lifting tech section. Cost really comes down to how much work you can do yourself and your source for parts.

as far as the lift goes i put on a 6inch superlift that ran me 850 including labor parts were around 600 including shocks...as far as axels im still working on that but im looking into a 14ff for the rear just hard to find one....good luck