How can you Prepare 5 N NaOH?

It's very easy as the molarity and normality of NaOH is the same. so all you need to do is to decide how much (volume) of that you need.

the molar mass of NaOH is 40.5 gr, so 5 molar (normal) solution needs times five of that in 1 litre. 5*40.5=202.5

dissolve it in 1 liter water (be careful as the dissolving process is highly exothermic)

Now you have 1 litre of 5 normality NaOH.