Hi all,

I'll expand a little bit on what John said.

I would suggest you create a separate drawing file, or as many as you need that will always be available to your system and contain nothing but custom blocks of the sorts of things you reuse on various projects.  These can be static or dynamic blocks.  It doesn't matter.  What does matter is that they're already created somewhere in a file your custom Tool Palettes will be able to find.

Once you have the block library drawing(s) set up you'll want to think a little bit about how you want to organize your tool palettes.  There may be specific categories of things you'll want on separate tabs, etc.  Work on that a little but don't worry about it too much, it's easy to change as you go.

Then open your block library files and click/hold/drag block by block into the correct tool palette tabs.  From there you can rename or reorient, set layers, and other properties as you like. 

This should get you started.  Everyone has a different setup.  Yours will be custom to your work too.  That's the idea.

Dave