Flashing correct software for nRF toolbox (iOS) to nRF54L15

Hello, I am a beginner to nRF54 series (currently have nRF54L15DK) and to understand the concepts and communication between nRF devices and iOS software with bluetooth LE I decided starting off with nRF Toolbox would be the right choice. I have got the iOS side (app) working but I am having trouble trying to figure out the nRF side (software that will be flashed to the device).
I have partially got the UART example working in nRF Toolbox app but I am very lost on the rest of it. I would like to at least get few simple examples to get started if possible such as "heart rate" or other simple examples.
It would be really appreciated if you guys can provide the repositories where I can download and get started, and if possible instructions or any steps I follow.

Thank you.

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