A single form of will is allowed, the will made before witnesses, written and signed by the testator in the presence of two witnesses. The testator may also acknowledge his mark at the bottom of the will instead of signing it.
No, there is no register of wills.
The will is kept by the testator in the place of his choice (at home, with his lawyer, in a bank, etc.).
In the absence of a register, the testator is advised to disclose the existence of the will to a trusted person as well as the place in which it is kept.
Otherwise, the heirs must search for the will in the home of the deceased, with his lawyer, with the bank, etc.