Write normal equation.
Write everything that is dissociated as ions.
Cancel ions that don't change.
For example, reaction between NaOH and HCl:
NaOH + HCl -> NaCl + H2O
ionic:
Na+ + OH- + H+ + Cl- -> Na+ + Cl- + H2O
net ionic:
OH- + H+ -> H2O
No idea why I wrote it all instead of sending you to read your textbook. It must contain exactly the same information.