Thanks Pro 
That's what I need.
@Morlanwen: Google said that it's Intuos. Intuos are really good, I'm working with Intuos too & so far love it 
Paint Tool SAI worth the whole price IMO which is relatively not expensive for the high quality & lightweight software it gives (around 30-40€). It certainly worth the 1 month trial & you can always decide later on. It doesn't laggs much on computer that's really something, and the line stabilizer is excellent.
Here's some tutorials I love & gathers a bit from here & there
Paint Tool SAI Brushes (that I use & love)
Darling Mignonette's custom brushes
Blanania's Brushes
Feylen's Brushes
Arryll's Brushes
Purmu's Cloud Brush
Ceru side note: DarlingMignonette's pack is excellent but it's a bit more complicated to install. I also highly recommend Feylen's & Blanania's
For creating SAI custom brushes (you might not need this rightaway though but always good to know)
About Colours picking & colour theory
General Colour picking
Skin Colour picking
Justin Oakford's notes on colours
: I also have several stuffs I had saved offline and don't know anymore where to find... like the skin colour swatches and palettes in general and for each DA characters etc2. PM me if interested. The DA one can be applied to everyone really since it gives the lightest & darkest colours of the skin. Before seeing this I didn't know that Viv for example have the darkest AND lightest tone on her skin, Cullen has the least contrast.
Step-by-step
Felitomkinson's lineart tutorial
Sully lineless drawings tutorial
Emegustart's colouring tutorial
ETC
Standard Canvas Size
Travelling with a tablet, how to take care etc
Art Tutorial masterlists
Drawing Tutorial Masterpost
Everything Masterpost
EDIT: sorry I mean SAI doesn't lagg at all >.<
It's very lightweight and excellent. You can go really far with that IMO, I'm trying to test its limit right now