Handwritten will needs no witnesses; it must be signed and dated

Dear PAO,

I’m a senior citizen and I believe I don’t have much time to live though I still have my full senses. I have some children left and I’d like to prepare my last will and testament so I can knowingly distribute my remaining properties to them. Is there any particular form that I have to follow in making my last will and testament? Can I leave a handwritten last will? If so, how? I hope you can enlighten me on how I can go about it. Hope for your help.