I actually worked through the Ardalambion course years... um, decades back (yikes).
Istan quete i vanya lambė, sorta.
These days I mostly use
Eldamo for reference; it neatly identifies which period a word comes from, provides referenced examples from Tolkien of how it was used (often
every example), and
the grammar section and
semantic dictionary are a lot easier to search usefully than the Ardalambion page.
If you take
G55 up on her offer to translate your sentences, I'll happily join in; and I could probably put some together if you want to have a go translating back yourself.
hS