Hi Anuianna - and welcome!
A cylinder is one of the easiest thing to draw in SU. First draw a circle
then use the PushPull tool
to lift it into 3D.
You can create more complex, extruded shapes with the Follow me tool
As for painting and texturing your model, use the Paint bucket tool
which also triggers the Material browser. There are no gradient colours in SU but you can use plugins to achive such effects or use images applied on the faces.
As for the Search function on these forums, use the box at the top right (or go to the advanced search via the link below it)