Most Muslims prepare for Ramadan by buying all sorts of food and cooking many types of dishes! Our forefathers -salaf al-salih- used to prepare buy repenting and asking Allah Ta’ala to grant them life and time to reach Ramadhan. The Prophet (SAAWS) used to give a long sermon at the end of Sha'ban, and tell his companions (Sahaba) the excellent virtues of the coming month i.e. Ramadan.
I hope that each and every one of us will start from now preparing for Ramadan
by repenting (Tawbah) and by having the full intention and will to do his at most effort during this virtues month to please Allah.