Hi John,
Writing wills is simple if one has a wife and kids and one wants to leave it all to them in the end. More complicated otherwise.
If the former, you just write a will leaving everything to your wife naming her executor, or state that if your wife predeceases you, then leave it to the kids naming one of them as executor. Get it signed by two independent witnesses as you sign it (preferably younger than you).
The only complications arise when there is someone you don't want to leave anything to (might result in legal action), or if your wife wants to play favourites on her death (as elderly types are often conned into doing by one of the siblings) in which case one may be wise to leave something to them in the first instance, just in case, else one or more may wind up with little or nothing.
Good advice is availabe all over the internet, and newsagents used to sell will kits for $20.
How to Write a Will - What to include in your will | Canstar
I had a will written up for me for free by my Professional Association, which I then scanned with optical recognition software, and which I then used as the basis to write wills for my parents and wife (it included nice looking legalese). Works fine.
In my opinion, whatever you do - do not use something like the State Trustees that we have in Victoria.
Regards,
Renato