How to make lead nitrate from pure lead
I am not sure of putting copper nitrate to lead. But the common way to produce lead nitrate is to put lead into nitric acid. It will produce lead nitrate and hydrogen gas.

$\ce{Pb + 2HNO_3 -&gt; Pb(NO_3)2 + H_2}$

If you have lead oxide instead of lead it also can priduce lead nitrate by adding to nitric acid

$\ce{PbO + 2HNO_3 -&gt; Pb(NO_3)2 + H2O}$