Over 20 response/opinions and not one person suggested practicing with .38 ammo! Hurray! My way of thinking is, if ya wanna practice with .38 caliber ammo, buy a .38 caliber gun! If ya wanna shoot .357 caliber guns, use .357 caliber ammo! Or get both and shoot to your heart's content, or your wallet's content - whichever dictates your life. My heart usually wins, nuch to the dismay of my budget.
There is lots of good, practical advice offered here. No matter what type of routine you adopt, the key is practice, practice, practice, and then practice some more. Time at the range is the most important factor. Have fun, shoot lots, and keep us posted.
Peace and God bless, Wolfsong.