In setting out your wishes the guiding principle is clarity. This point cannot be stressed enough.
Punctuation, if used at all, needs careful attention.
In professionally drawn wills in the past, punctuation was never used. Today some professional wills do include punctuation but much depends on the style of the draftsman. In a home-made will any punctuation should be used very carefully.
It is 2015 so I am dealing with a home-made will where no executor was appointed.
The question of who is entitled to a Grant of Letters of Administration with the Will Annexed turns on the construction of the testamentary gifts and the answer is by no means clear. The gifts include gifts of assets that no longer exist and the last paragraph of the will is ambiguous. There are two faint marks in the text which appear to be full stops but might be accidental blots of ink.
The outcome of the case will depend on the interpretation placed upon those marks.
The important thing to bear in mind is that the will must work when viewed in isolation, that is to say, without the benefit of inside knowledge of the testator's affairs or evidence of such from a witness. Once you have finished your will, leave it for 24 hours then return to it, read it and ask yourself, "would a complete stranger reading this understand what I mean?'"
Be absolutely honest with yourself and only proceed further when you are satisfied that the answer is 'Yes.
Even better, get a trusted friend to read it and tell you what he thinks it means. Compare what he says to what you intended and amend your writing accordingly.