Now you've opened up a can of worms regarding me and
@Sir2fyablyNutz (who will be along shortly because I tagged him) and all our DIY links.
Dannyv45's blogs will give insight into all aspects of DYI, from steeping to what supplies to have on hand to a basic walk through mixing your first E-juice.
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E-Cigarette Forum - dannyv45 - Blogs
Hoosier's blogs concentrate on fine tuning your mix and give insight on additives.
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E-Cigarette Forum - Hoosier - Blogs
Boletus's blog's concentrate on formulation of nicotine bases regarding proper calculations methods for figuring Nicotine concentration as well as safety.
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E-Cigarette Forum - Boletus - Blogs
Ginger's book "E-Cigarettes 102: DIY E-Liquid" delivers an in depth easy to follow guide in the art of DYI.
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E-Cigarettes 102: DIY E-Liquid
I recommend viewing VPLive Vape Team Episode #82: DIY Safety and bookmark it for future reference. It explains safety in all aspects of DYI.
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VPLive Vape Team Episode #82: DIY Safety
The "stickies" pinned at the top of the
DIY E-Liquid Forum page will explain a lot of the how's and why's.