I think they gave them to you:
1. Just use sand, there is still a lot of debate about mud
2. Chaeto - easiest to trim when getting out of hand, I think any true mixture of plantlife will help out.
3. Again you can add, but it is harder to trim
4. I would add some cleanup crew into the ref. just to cleanup and waste that may build up. I would also make sure you are runing some type of filter floss or something to catch large food particles before it enters the fuge area. I would add LR in there too, so LS, LR, chaeto, and some cleanup crew.