A good mantra practice requires meditation. First you need to be aware of what you need in life. It is easy to say “money” and then do Lakshmi mantras solely. Given the number of hits on Lakshmi mantras found on Youtube compared to others, this is common for a lot of people. But many who are reading this already have their basic needs taken care of for now and probably need something different.
Always start with a mantra for Ganesh. Om Gam Ganapataye Namah is a good mantra to start even if uttered a few times. After repeating this a few times, really try to “see” what you need in this life. Chances are it’s not money. During the past year, I have focused on mantras for protection from COVID. Like Narasimha and Durga mantras.
Do you need better health? Try the Mahamrityunjaya mantra which is a Siva-based mantra. Do you need help at developing a skill? Try a Saraswati mantra. Do you need courage and strength: Try Hanuman mantras.
I have noticed that my life has “themes” to it and I try to be mindful of what those are and do mantras accordingly.
Please take care not to do mantras during Rahu Kalam, a time span of about an hour and a half each day which is “Rahu” time. To find what time of day that is in your time zone, I’ve found this website helpful.
However, if you want to do Rahu mantras during that time, you will receive benefits.
May you have a blessed practice.