How to find the net ionic reaction with only reactants/reagents?

[PhizKid]

For example, if I am given something like HCl and NaOH, or $HNO_3$ and $Ba(OH)_2$. Can someone explain how I would find the net ionic reaction or provide a link to a good tutorial on how to write the equation for the total/net reaction with only the reagents/reactants?

 

[Borek]

As you were told elsewhere, the first step is to write reaction equation with molecules. Then replace molecules with ions (dissociation), then cancel ions that don't change (spectators).