Need R Script Tutorial within Power BI

Have you looked at the tutorial that Microsoft posted?

https://learn.microsoft.com/en-us/power-bi/developer/visuals/create-r-based-power-bi-desktop

Keep in mind that by default, the visuals are all SVG images.  If you want to make it somewhat interactive, then you will want to incorporate ggplot2.  If you aren't familiar with R yet, then learn the basics of that first before attempting to build a visual, because you will need to think through not just the operations that you want R to do, but also the dataframes you want to pipe from PowerBI to R.