I'll take a shot at explaining mmj. I've been taking mmj for going on 3 years now.
However, I do NOT claim to be an expert and urge you to be cautious.
I get my mmj from the Realm of Caring (ROC) folks here in Colorado. They have a Facebook page and have expanded to other states. They offer mmj as a concentrate or suspended in olive or coconut oil.
You first need to understand what the components of mmj are. There are over 100 different cannabinoids; one of my attachments shows the most important ones and their uses. Of these we are concerned about two: THC and CBD.
THC is the psychoactive component, the one that gets you high. Be careful with this one. THC supposedly has limited therapeutic value but my progression sped up when I eliminated it.
CBD gained fame from ROC's Charlotte's Web. Impressive story; it helped change Sanjay Gupta's opinion about mmj. This is what caught my attention. Google it.
Next you need to know which cannabinoids at what potency are in your product. ROC assays their product, see other attachment. This is where the DIY products such as RSO make me nervous: how do you know what the potency is?
The ROC products come from cannabis strains bred to favor either THC or CBD. As such, I use two separate products, one high in THC and one high in CBD.
Using the assays I know the potency of both, the THC is ~100mg/ml and the CBD is ~200.
There are 20 drops (of water, I assume olive oil is similar) in one milliliter (ml). Each drop of my THC product contains 5mg. The math: 100mg/ml times 1ml/20 drops = 5mg per drop.
Finally, dosage. I've not found a reputable source willing to say "take X milligrams".
My dosage (NOT YOUR DOSAGE) is 50 mg per day of each. 2 drops of the THC product with each of my (tube) meals and 4 drops on a wee bit of graham cracker immediately before bed. The CBD product, being twice as strong, takes half as many drops.
The first time I took mmj, I took the full dose. After ~90 minutes I knew I'd made a mistake. It took a couple of hours to pass.
Mmj can be consumed by inhaling (smoking or vaping) or ingestion. When inhaled it kicks in quickly.
It is very important to be aware that orally ingested mmj can take up to 2 hours to be active. The news is full of stories of folk who ate part of a multi-dose cookie, felt nothing after 30 minutes and scarfed down the entire cookie. Overdose.
I would suggest you start by taking a dose that contains NO MORE THAN 2mg of THC and waiting for 3 hours to see if you feel it. Work up from that. Add more doses throughout the day versus one big dose.
Where to stop? What should your final dosage be?
Damn good question. My dosage seems to work for me, your mileage may vary! ;^)