Kaltxì nìmun! (Hello again!)

[Nahura]

Kaltxì frapo! Oe omum sngä'iyu na'vi, slä txampxì oeyä aylì'u tare dict-na'vi, Oe nume, ngian.

I will continue learning and speaking this language, any help would be appreciated !

This was basically a test to see how far i've come in the month or so i've been learning, i think it's not bad. Irayo, ulte Eywa ngahu!

- P.S. Here is a random picture of my favorite pandoran animal, the ikran: 

[Toliman]

Kaltxì nìmun ma Teynew Tepsawl 

Welcome back here!

[Alìm Tsamsiyu]

Kaltxì ulte tolätxaw nìprrte' ma tsmukan oeyä!

The usual place where we gather to learn and discuss the Na'vi language these days is on Discord --> http://discord.me/learnnavi/
We'd love to have you join us there!

Apart from that, if I may offer some corrections to your sentence there:

Kaltxì frapo! Oe omum sngä'iyu na'vi, slä txampxì oeyä aylì'u tare dict-na'vi, Oe nume, ngian.

Kaltxì ma¹ frapo! Oel² omum sngä'iyuä³ aylì'ut² leNa'vi, slä txampxì aylì'uyä³ oeyä lu ftumfa⁴ dict-na'vi. Oe nerume⁵ ngian.

• The word "ma" is essentially like a verbal @-sign, you use it when you are addressing someone or a group of people directly
• -l / -t endings: Because of the free word order of Na'vi, transitive verbs (such as omum) have to have their subject (-l / -ìl) and object (-t / -it / -ti) marked to avoid confusion
• -ä / -yä endings: These mark possession.
• lu ftumfa: the verb "tare" seems to strike me more as connecting to other people/things. In this case, I think you were just trying to say that you use dict-navi to look up most words still, so "are out of" or "are from" seems to make sense here
• the <er> infix is the "imperfective aspect" - it essentially turns the verb into an -ing verb, as it is ongoing. You learn, but you're still learnING too

[Teyvit te Koletxi Rosarey'itan]

Kaltxì ma tsmukan nìprrte