The bag directs that you NOT rinse the soil before putting it in.
Just cover the substrate with something before you slowly add water in order to limit the cloudiness a little bit.
Using a seeded filter is a good idea to help speed up the cycle.
There is a lot of ammonia that will be released (in order to help the tank cycle) so you will want to avoid adding any fish/inverts until the ammonia levels drop.
Adding a lot of plant mass and/or doing water changes can help get rid of the ammonia more quickly.
Well this isnt recomended unless you really know what you are doing, or if you have balls of steel or brass. But aquasoil will lower the PH and render ammonia into ammonium. Which is harmless to inverts/fish. So long as your PH is buffered down to 6.5 or below it seems.
I just did this with my CRS, all but 2 made it, and those two were just shipped so were already under a lot of stress. But note I also already had a lot of seeded material and filters in that tank too.
Dont wash the soil before adding it, just add it. And yeah you can add say terta safe start and it should speed up the cycle a little bit. As a side note, wait 24 hours AFTER adding water to the tank, and dont add any other chemicals or water changes for at least a week after adding the bacteria.