A simple procedure for writing Lewis dot structures was given in a previous post entitled “Lewis  Structures and the Octet Rule”. 
Several worked examples relevant to this procedure were given in previous posts please see the Sitemap - Table of Contents (Lewis Electron Dot Structures).
Let us consider the case of nitryl chloride NO2Cl. 
Step 1: The central atom is the N atom. Connect the atoms with single bonds. 
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| Fig. 1 : Connect the atoms of NO2Cl with single bonds. | 
Where n in this case is 4. Where V = 5 + 2*6 + 7 = 24 , V is the number of valence electrons of the compound. 
Therefore, P = 6n + 2 – V = 6 * 4 + 2 – 24  = 2     So, there is 1 double bondStep 3 & 4: The  Lewis dot resonance structuresof  NO2Cl  are as follows:

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