I am a bit of a pool rookie, but I have tried to learn quickly.
Here are a few tips.
Turn your pump on the highest speed.
When adding salt, I get the bag up on the edge of the pool over an inlet in the shallow end.
I cut the bag at the base and let the whole bag pour into the water jet of the inlet spreading it out some.
Then take your pole and pool brush and sweep the salt back and forth until completely dissapated.
Repeat until you have put in, and fully dispersed, about 2/3 to 3/4 of the reccomended salt in lbs.
Wait at least 24 hrs. and take a salt reading.
Consult the chart and add more as needed creeping up on your desired ppm.
I fully dispersed 3-4 bags at a time when adding my first load of salt (600 lbs.)
Some SWGs have a "salinity test" which seems to be accurate when tested against the salt strips I bought from TFTestkits.
Check this pool school article out for specific chem balance for SWG pools.
pool-school/water_balance_saltwater_generator