Go soiless. Fastest learning curve, bar none. If you can follow instructions, you will have a highly successful grow your first cycle.
autoflower or photoperiod is irrelevant. The gas-to-water mixture is the primary concern - and not all chunky it can significantly impact root growth. With coco you want 33% of volume to be perlite or similar (e.g. #2 perlite, #3 vermiculite USA standards? may vary.) Sphagnum peat moss holds more water per volume, so you want 50% perlite or similar per volume when using that.
I suggest not using coco. If it's not buffered properly, it'll fuck up a grow in a spectrum of irrelevant to severe. If it's not washed and buffered properly, you could get Na poisoning, which will also throw a big wrench into any plans. At best a long delay and worst, dead plants. Unprocessed sphagnum peat moss is no good, too... needs to have wetting agent and ph-balanced etc, but there are well-established sources that long predate marijuana branded stuff. Promix is a great option - HP or BX. Think these come with 25% and 15% perlite, respectively. So, they need more added - recommend vermiculite #3 as it adds some plant available silica and is good size for drainage/aeration without impeding roots in a significnat way.
70/30 coco+perlite is convenient. No denying that. Don't have to mix anything and it's redy to use out of the bag, as long as you trust the brand.
Nutes.. i'd go jacks or similar 3-nute setup. A base 'hydro' with trace elements along with calcium nitrate and magnesium sulfate (epsom salt). JAcks 321, megacrop, cropsalts, masterblend, southern ag, kosher-something, lol... more than one brand to choose from. The ones that don't put the trace elements in the base are the greedy ones. Otherwise, can buy generic cal nitrate and epsom or if they do and you go that route due to availability, have to also buy trace elements supplement.
Never have to buy "calmag" in your life. 3 parts can do it all well seed to harvest.
Even if you don't go with jacks, i'd mimic their mixed concentration of nutes across the board. I think it's a bit high in K, but whatever adjustments you need will be minimal in nature. e.g. they instruct 3.6g/gal, but i find better results at 3.3g/gal which results in 180-190ppm K instead of over 200 - YMMV. Anyway, mimic their ratio and concentration (ppms across all nutes) and you'll have great results following basic rules of soilless growing. Stick to that formula to start, then adjust based on how the plants grow in front of you and you'll have a rock solid formula tailored for your environment by the 2nd grow. Fertilizing should be a short learning curve, if systematic about it.
guides and articles on cocoforcannabis.com are a great source with limited to no bro-science nonsense, as long as you avoid the forums. Explains finer points of soilless growing whether you use coco or something else.
When it comes to soilles / hydro context, there's not so much a quality difference in fertilizer. There are different options and ways to deliver what ends up being a similar ratio and concentration and those differences 'could' cause some variation, but it's small. Soilless/hydro nutes will be 100% soluble and 100% plant-ready. The resulting concentartations and ratios that exist directly around the root is what matters in regard to fertilization -- all available in sufficient quantities and not impeding each other. That exact amount will vary by life stage, but that's a very quick transition with soilless/hydro systems... a timely formula change and done.
Whatever you do, do not overpay. More expensive stuff does not work better. If you compare ingredients you find a shit ton of overlap with other cheaper options.