1. House and garden bat special, provides everything a plant needs for 6 weeks which should cover your “grow” stage on the auto, (keep in mind after 2 weeks you can feed small amounts of nutrients)

2. As others have mentioned your best bet would probably be bio bizz, due to it being very forgiving and also easy to use, but if you prefer doing things “naturally” Google says “ worm castings, blood meal, fish meal, or bat guano for nitrogen; bone meal or rock dust for phosphorus; wood ash or kelp meal for potassium; and dolomite lime for calcium or magnesium”, you can buy all these as dry amendments some slow release and some fast, (slow release is harder to see if you’ve over or under fed as deficiencies slowly creep up over a few days/weeks instead of over night/ 2 days) also using apples blended into a liquid form will help your plant bloom faster, this is used for fruit trees that are unwilling to naturally produce fruit, something to do with the gasses that the Apple releases tricks it into to thinking it’s dying or something along those lines, not completely sure of the science so don’t quote me

3. Is it 7 hours full sun or slightly shaded? If it’s full sun the 100w will be more than enough to get a decent yield with hybrid lighting, if shaded you may be a lil disappointed with the yield as the 7 hours shaded will most likely be a “sleep” cycle for the plant, basically a small rest to prepare its self for the more intense artificial light

4. Some tips I’ve learnt along the way, reducing the light during the flush stage will speed up the finish time by a couple days and produce slightly better aroma and flavour as well as producing more trichomes due to the extra amounts of cold it will get during the “night” cycle, a heat mat can be used to keep root zone temperature optimal (better suited for uk winter) but you will have to water twice as much so keep that in mind, running a light cycle of less than 10 hours during flower will take 1-2 weeks of your grow making your plant finish earlier, this works by making the plant think it’s almost winter so it speeds everything up (however this can cause hermies)
Using 2 light spectrums such as “white” leds and “red and blue” leds will give you increased yield due to the spectrum being so wide allowing the plant to do as it pleases, clonex in your water for the first couple of weeks of veg and flower build a great root ball as well as great immunity, when flushing allow your plant to slightly dry out inbetween the last 2 waterings, this tells the plant to force all its energy into the buds to look for extra nutrients that it can use and when your about to chop let it die on the vine, this will give you a almost perfect 14 days dry time with buds being just about touch and crumble with stems snapping with ease, then put those in a jar so they can gain some humidity back and you’ll have a perfecto smoke

I could be wrong as most of it is “bro” science, but The people I’ve shared some with say it’s the best they have smoked, I personally don’t think that but I guess it’s the same as a high tier chef, he doesn’t really think his food is high tier because he knows no different