I'm no expert, but I'll take a shot at the transcription of Quenya cáno 'commander' for instance (although the more detailed meaning is actually: 'usually as the title of a lesser chief, especially one acting as the deputy of one higher in rank').
The following is my guess at the transcription. I don't know how to show you in a picture in this thread, but just follow the numbers given below to find the Elvish characters in the chart in The Return of the King. The names in italic lettering below are just the names of the characters -- all you really need is to match the numbers to see the shapes. So I think one way to write this word would be:
calma (3), followed by an a-tehta (three dots is usual) above a long carrier (looks like an undotted j), then númen (17) with an o-tehta (looks like a curl open to the right) above it -- above the character númen I mean.
Thus calma (c), long a, and númen (n) with o above it.
If 'leader' is correct as a translation that is! and cáno 'commander' close enough for you too!
So far it does look like you want a Quenya name with a similar enough meaning, also in the Elvish letters. Incidentally, the chart gives the 'basic' shapes of the letters, which can alter a bit of course, according to a given font or design.
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