Feeding schedule

Most soils contain enough fertilizer for the first 2-3 weeks. I can see that you are using the Advanced Nutrients. For now I would just start following their feed chart after 2 weeks. But for the next time it is the best to start with a light mix soil than you can start giving nutrients from the start and just follow their feed chart (you can download the feed chart from their website).

You can already give fertilizer according to the manufacturer's dosage for the first week.

if your growing in soil it should not need anything for the first 2weeks-2months depending how fortified the medium is. If your growing in soilless that is fortified 2 weeks is about the time frame. If your growing in soilless that is NOT fortified like just pure coir/peat and perlite you need to fertilize from day zero. Now how much and what type of fertilizer will also be different depending what one you use. Liquid are available immediately. soil amendments take a week or two to fully break down and become available to the plants. PH needs to be monition as well as EC for liquid nutrients. Some mediums "coir" require other supplements like Calcium and Magnesium. The last point of interest is if its an autoflower or photoperiod plant. Autos don't require as much feed as photos. You will need to google some shit and find out what going to work for you and within your tool-set. Good Luck!