Looking for info on Sourdough Starters

First off, I need a new starter.  I moved a few years ago but sadly lost 
my starter in the process.  I got in a hurry and didn’t do what I should 
have done, which was make my starter into a drier levain so it’d survive 
the trip better. So i’m still trying to get another one going.  I’ve 
made more than a few but just wasn’t happy with what I got.  Mostly, 
just really slow acting and really sharp flavor, if any.

Anyway, to make a long story short I’m trying my best not to “cheat” and 
use commercial yeast to get it going.  So, anyone have a good 
recipe/method of making a good starter?

I’ve also asked the firend who gave me the original starter and she said 
it was made from yogurt but I can’t seem to find any yogurt in my area 
that isn’t full of additives and gums.  Sad thing is, she no longer 
bakes so...  Any ideas?

Thanks Guys,
James