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You'll need:
Software:
This is the PCB we'll be making a stencil for. It only has one chip but of course you can use a more complex layout
Your PCB software should be able to create/export the Cream Layer (solder paste layer) in Gerber RS274x format. In Eagle you can make your own Job for this quite easily
Also export the Dimension layer (PCB outline) since that will help a lot in registration