GardenLady, so many variables to address but the most important one is that everyone is different in their reaction to cannabis. Despite my ridiculous masculine appearance and macho attitude ( ha-ha-ha) if I take two or three hits on almost any strain, I am done for the night. So bear in mind, that you can do more once you have identified a few strains you like in terms of making CONTROLLED doses of tinctures and cannacaps or other edibles but you should read as many well-written articles on dosing. Their are some very well accepted individuals who clearly show how to do this. Google cannabis dosing.
Unfortunately it will take a few tries to get it right. Remember, you can go buy pain relievers over the counter that read 325mg, 500mg, 800mg....etc. that’s convenient . Your cannabis can become almost as easy with a little trial and error. Read up on what to do if you’ve had too much as well...
if I read your concerns correctly, you’ll be nicely satisfied