After seeds germinate?? How to transplant to final pot? What soil?

After the seeds germinate do I start them in a smaller pot inside until they are 6 to 12 ibches tall under 18 hourrs light 6 dark an let them grow inside than transplant to a bigger 3-5 gaallon.pot outside? Or can i put the germinating seeds right in the 3 to 5 gallon an put them outside from the start? I bought this Build a soil to start the first 8 weeks but than what shld i feed it after the 8 weeks or add to this mix? Im growing white widow auttogerminate seeds.16534106462422663587857037739336.jpg
 
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