Eric has some good points. Scott Hall is a very capable teacher. I highly recommend his program. Also Syntropic Solutions has a webinar, by Thiago, which is equally as good. I was also going to recommend that you go deeper with your study. Reading books is good, but a real workshop is better (even if it is online). After that, there is a woman in India who has a syntropic food forest that is a couple years old. I think you would benefit greatly from visiting her. You can learn more here:
https://www.facebook.com/KambaFarm123
About the sunlight needs of the trees, YOU don’t decide the level of sunlight a tree needs, that is written into their DNA. The tree thrives on the amount of sun that it thrives on. Your job is to learn its needs and plan (and manage) your farm in a way to meet the needs. If you want to know some of the strata of different trees, take a look at this excel list created by others (it is a work in progress and some species info is not yet determined, but many are listed). It gives many species and both their srata and succession level. This info is critical for planning.
https://docs.google.com/spreadsheets/d/1ctk8cbHOqbZFG2Sq1nUsd-n0J-KoB-vr185z6dhefwk/edit#gid=1919914160
What you might discover is, many fruit trees that conventional farmers grow in full sun (coffee and cacao for example) actually thrive in shade or partial shade. So either you have to know how the tree grows in nature, or just use that database to look up the correct level. You cannot figure this out by just looking at how conventional farmers grow their trees.
About spacing the trees, unfortunately there is no recipe for this. I provided a table with that info in my guidebook, and most of the time that will work, but in some cases it will cause problems. For example, if you have coconut for an emergent, those trees can be spaced closer together than other emergent trees.
Yes, many farmers plant 2 or 3 times the number of trees they plan to have in the end. That way you can select the strongest ones and remove the rest.
I understand your concern about pruning the trees. That is natural if you haven’t done it before. Go visit Kamba farm and work with them for a week or two at a time when they are pruning trees. You’ll overcome the fear right away and probably be amazed at how happy the trees are after they are pruned. There is a right and wrong way to do it, so you need to learn first. Once you do it, it will come natural and you will know that the food forest benefits from this action. Anyways, it will be many years before you need to cut the tops on your fruit trees, so you’ll have time. But I encourage you to face that fear.
About the mulch, I agree with Eric. Since I wrote the guidebook, we make way more efforts to find material for mulching. We cut limbs out of old trees in the area or cut grass and pile it up. You can use anything as long as it doesn’t have thorns. If you really are limited, you can cover the soil with plants! Just plant a diverse consortium very densely and remove or prune as they get to crowded, selecting for the best plants and trees.
Really, to learn more, you need to take an online workshop. It is not feasible for me to type answers like this, and I suspect they will just lead to a series of more questions. Because until you get the big picture, then learning by reading will just cause confusion.
Let me know if you have trouble connecting with any of the teachers we mentioned.