I’ve been wanting to make a GUI or tool where you can pay with in game currency to place certain objects. Kind of like the building system in bloxburg.
Have you tried looking on the community tutorials section? People like EgoMoose have great tutorials on this kind of thing.
For this specific topic, I recommend learning from a tutorial series. For example zblox 164 made multiple tutorials about this topic. You can watch Part 1 of his placement system tutorial here.