Before wiring the transformers,you need to state if it’s a coretype or a shell type transformer.In coretype,you have the coil on the outerside and the core on the innerside and in shell type you have the coil inside the core.The shell type arrangement needs less copper and more core and is more cost efficient as compared to the core type.On the other hand coretype needs more copper and less core.
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The arrangement of the core is of various types too like LI shape.EI shape based on the type of the laminated sheets used.The core is not made up of a single chunk of Iron ,rather it’s built up of laminated sheets to dminimize the loss due to eddy current.
In shell type first of all the windings are wound across a wooden support and then laminated steets are inserted in the gaps.The gap left is filled with varnish and cotton.
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http://www.tpub.com/content/et/14093/css/14093_56.htm
That’s in a nutshell.Please get back to me if you need further details.
A word of caution:If you are not professionally trained in winding up of transformers,please don’t risk trying it.It might lead to loss of resources,material and may god forbid,life.