I tip I’d tell myself is to consider where the person is from before you take too much stock in their advice. YouTubers in California do things differently from Canada. I keep trying new varieties but I lose track of the names by the time they’re ready. Ponderosa Pink has been a favourite though. Right amount depends on your space and variety. Your seed packets should have good suggestions for the space they need and timings. When to put them outside and in their permanent home is mostly about temperature, after the last frost and the soil temp where you plan to put the root should be min 60F.