According to my previous experience and as a personal recommendation, you should always start with a plant that does not need much water and is relatively easy to care for. Once you have acquired that experience and practice in knowing / identifying the needs of a plant, you can keep adding different types of beautiful and amazing plants to your garden.
I also advise you to remove all unnecessary plants because they suck moisture. The site https://grass-killer.com/reviews/best-weed-killers-for-bermuda-grass/ helped me with this, where I found the grass killer and it saved my garden. I advise everyone to use it