Step1: first open new project Ctrl+N and chose ur image size for me 800*600 pxs are good

Step2: Then go to Layer > New Fill Layer > Gradient and then select the parameters u prefer U can use the image below as reference and you can move the gradient to the side of the pic...


Step3: In adobe Illustrator and this program is greet u can do such greet effect and create ur own vectors by it ((Down load illustrator HeRe))
First select Text Tool(T) and make ur space for the text u want (just like the image below) then type the letter as 2
THEN by this tool which u can find in tool bar select it and go to the letter and press on it
SO that the letter converted from text feature to shape as shown in the image below and then go to Effect > 3D > Extrude&Bevel
Step4: you can use the image below as reference to adjust ur parameters
NOTE:from this options you can control the 3d effect of the letter

Step5: use Drag and Drop method to bring ur work from adobe Illustrator to Photoshop
As you see in Layer pelette the Illustrator work appear as Vector Smart Object
Step6: make anew layer above the vector smart object then select Pen Tool(P) and make ur selection as shown in the image below then right click on the selection and chose Make selection and adjust the Feather to (o) px

Step7: on the selected area go to Layer > New Fill Layer > Gradient and adjust ur parameters ..you can use the image below as reference
AS you see here the Layer pelette ....u can group each vector smart object and its gradient layer in one group
Step8: Then repeat the from step3 as you first return to Illustrator and type ur letter or no. then select the tool to convert the text to shape and go to Effect > 3D > Extrude&Bevel and set ur parameters to control the 3d effect of ur letter
Again by Drag and Drop method to bring the Illustrator work to photoshop and make ur selection and so on ...........
Here u make ur gradient colour for the selected part of ur letter

AS you see the two vector layer and each have its gradient color and grouped
Repeat from Step3>>>to>>>Step7




Finally you can get this results
Final Image: you can reavh this final result by using some effect and brushes
u can download these brushes from HERE