First grow gonna use soil, need some help with nutes

so im doing my first grow in soil i chose plagron bat mix and i just need some help on what nutes i should be using its my first time and im not expecting to do mad stuff just want something basic i was gonna get plagron alga grow and blow but held off to see if there was an alternative that maybe cheaper and better. also if someone could tell me about liquid seaweed should i be using it everytime i water or no im not sure.
 
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