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First, there is lots of good information out there, and I am not an expert; but I'd like to share what works for me in case others find it useful.
Here are two good examples:
I'll talk about two approaches, and then discuss some background and math (just skip the math if you're not interested).
We want to do this because:
Same goals as above, except that we opt for quick and “dirty”
We've got two goals: a 1L starter and 0.5L of overbuild for next time
Have followed one of the procedures above you're now ready to either swirl the flask/mason-jar every once in a while (whenever you think of it) or use a stir-plate
Now you've got 1.5L of starter.