Here is my very first watercolour tutorial that you've requested me.
and something I would like to say before you start
Make sure you have some tissue papers while you're working, This will helped you control the water flow, cleaning your brushes,etc.
and don't use only one water container, let's find 2-3 of them
one is for washing your brushes and one for mixed with paints.
If you use only 1 water container, the water will become muddy and give you some horrible dirty effects, ruin your precious work for all time.
And use the best quality brush you can afford.
Here's the link to my 2nd watercolor tutorial.