I think everyone missed the point that it was a dwarf lion. Now no disrepect, but these things are tiny, shy individuals that perch on rocks and hide in corners. Also that it appears that wherever this person works has lots of tanks (ie. a fish store). These on-order fish could always be something the store is ordering and dumping into their tanks... *shrug*
Another missed point - the alternative options. Anyone would be *nuts* to think that everything listed would even fit into a 35g with water. Hah.
However, with that said -- I wouldn't house anything else in a 35g other than the Lion. We have a dwarf in with a dozen damsels, a picasso, a large faerie wrasse, and an undulated trigger in a **210g**. This is reasonable. A 35g? No.
My suggestions for the 35g, keep your lion in it. Maybe the damsel (pray, hope and pray some more that the lion *DOES* eat that dirty damsel toiletbowl cleaner). Save the rest of your purchases for the 100g and keep the 35g with your pretty lion.
And to answer your "what to have at the bottom" question... get lots of rock (preferably live rock). About 40 pounds worth (whatever that is in kilo's). A sandbed if you like, not necessary for housing only a lion (plus it'll make it easier to clean). A barebottom removes the necessity for hermits. In which case I'd suggest some snails (several astrea should do the job).
Let us know more specifically your plans and we will be better able to direct you to your answer.
Hope this helps some.