Ok you have a great choice in the organic gia green. Being organic you need to be on a schedule to add the nutes before they are needed to allow a conversion to take place.
https://www.gaiagreen.com/_files/ugd/ca863c_9ca48f6abdfb40ccb5cb57f7bed80f90.pdf
This is the feed card for the gia green.
Now the flowering is not an organic product. The nutrients will be readily avaliablle as soon as installed.
During the growth period there is an early and mid flower where nitrogen support is still needed until the final push. You will need to bridge this gap with an organic fertilizer that may become less effective once you put the mineral feed in.
I have no experiance starting organic and ending with chemical ferts.
Recommned you check our grow diaries and see if anybody can give you directions on this.
Hit the 3 horizontal bars top left on the header. This tales you to the index for the site. look for forums and then page scrolldown and look for grow diaries.
Once in grow diaries use the spyglass feature to add keywords like gia green and fox farms bud bloom. See if anyone has done a simular grow.
Good luck!