There is actually no ideal number of shares to issue. It depends on individual circumstances and business structure. There is a minimum requirement of 1 share to be issued, so if there is only 1 Director, who also happens to be the only shareholder, then 1 share might be appropriate.
It is common for 100 shares to be issued in order to easily allocate a percentage of the shares according to control and commitment.
It is important to always keep the following in mind when allocating shares:
In any case, if you are unsure of what is best for you and your business, seek professional advice through an accountant.