Have fun! Rodinal is a very fine developer, used by greats such as Ralph Gibson. It's wonderful for when you want texture in your prints. Keep in mind that it is a very powerful developer, that will keep developing almost forever, evenly across the tone range.
Use 1+25 for beautiful sharp negatives with fantastic contrast and grit.
Use 1+50 for a bit smoother tonality from your negatives and slightly finer grain, but equally sharp.
Standing development gives a completely different result, which sometimes works, and other times doesn't. It's a useful tool, but I wouldn't use it for everything. It's like having two developers in one. I prefer 1+25 and 1+50 to standing development, but that's for you to decide.