This is the best sight for all those types of questions (and many more)
I am fairly new but I can answer a couple of them at least.
They tend to rub themselves on branches etc if you have them in the viv but don't try and pull any of it off yourself (even though it makes them look a bit like an alien) as it will make them sore.
As babies it seems as though they shed continuously, mainly because they grow at such a vast rate. Shedding equals growth so its all good
They are quite likely to shed in patches especially as they get older and the shedding slows down as the growth does. As babies they look like they have exploded (quite amusing).
Baths help ease the itchiness and helps beardies in their shedding.
Sometimes they can look a little paler just before they start shedding and yes after a shed their colours generally brighten.
They may also go off their food a little or their behaviour may change a little (getting grumpy) until the shed is over (although not sure if babies can be put off food
)
My beardie sometimes blows out her beard and it can get a bit dark as it gets a bit uncomfortable. I think she blows out her beard to help the shedding skin come off, but this is just my opinion.
Make sure to clear out the shedded skin once it has fallen so your lil one doesnt eat it. (Just good husbandry)
Can't think of anything else atm