That is how I feel as well.
Trying to figure out how much plant I need to source to make oil before my grow is ready. My first seeds should arrive this week. Also need to decide and order what other seeds I need to add into the mix.
Feeling overwhelmed and desperate right now.
In my limited experience I have found that it makes about 10-12% of the dry weight of bud (strain dependant) and less for the high CBD
strains (not sure hw much less but have read somewhere that it's about half).
So an ounce of dried trimmed bud would make between 2 and 4 grams of oil but probably safe to average that off to 3 grams.
As for buying the right strains, well I know how tricky that can be but Motoco will steer you in the right direction and to my mind there are always similar alternatives if you cant find the exact strains. High CBD strains are a bit tougher to find but in recent times they have become a lot more popular and therefore easier to get hold of. There are even breeders who specialise in these such as CBD Crew.
One thing I don't know and maybe someone can comment is regarding auto's. Considering they have Ruderalis as part of their genetic makeup, would they be lower on the scale of medicinal properties, compared to photo plants with just sativa and indica heritage.
Best of luck and you will find all your answers on this forum. So many very experienced people all over the forum. Read, make notes and re-read your notes, thats all I can really give you as advice. There is loads to take in and it can be overwhelming but making notes just makes all the difference.