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You can use symbol-value to look up dynamically bound variables. The easiest way to ensure that is by using defvar/defconst/defcustom for such variables, that way they'll always be dynamically bound, even with lexical-binding enabled. Plain setq will not do as soon as lexical binding is used and is discouraged for defining variables for that reason.
To ...
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You can eval to recover the value of a variable symbol. To modify it you can use setf:
(setq x 1)
(setq xref 'x)
(eval xref) ;; Returns 1
(setf (symbol-value xref) 2)
(eval xref) ;; Returns 2
The value of x is now 2
setf is the generalized version of setq that lets you place values in arbitrary "places" within an object. For example you can change ...
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