i’m glad you got that first problem sorted out!
As far as stars are concerned there are many ways to go about it but it is one of the large tasks on my list which I have yet to tackle and couldn’t confidently offer any solid advice as I have some ideas that I need to test out before I can prove that they work well.
Having said that, it is pretty common practice to use things like noise with an additional panning layer to mask it out in order to give it a little sparkle, you could combine that with a stylized Texture, a good program for that is free and open source, I believe it is called spacescape. This would be wrapped up in to a material that is used on a skybox or a sky sphere. you could even use this on your daytime sky material and have it lerp using a parameter collection driven by your timeline on your sky blueprint.