In what cases would you put an -l after Oe?

[Unilsrewtu]

And what other suffixes can you put on Oe, and what do they mean?

[MIPP]

And what other suffixes can you put on Oe, and what do they mean?

You don't only use -l in oe.
As you have to understand that, once it's very important, i'll try to explain the best i can, so i will put here a quote from Na'vi in a nuthshell - which i recommend you to read and learn.

Cases

Ergative and acusative

When the subject (nouns/pronouns) of a sentence performs some action (verb) that affects
another thing (direct object), special endings must be placed on the subject (called the
ergative) and the direct object (called the accusative) to indicate role. The endings are as
follows:

Ergative: If the subject ends in a voyel, you use -l
             If the subject ends in a consonant, you use -ìl

Accusative: If the direct object ends in a voyel, you use -t or -ti
                   If the direct object ends in a consonant, you use -it

As an example, consider the verb yìm in the following sentences:

Oe yìm. No direct object, so no ergative.
Oe-l yìm po-ti. Direct object, so use the erg/acc.
Oeng-al yìm po-t.
Nga-l yìm ikran-it.

Language Note: Looking at the 2nd sentence, you will see that the i on the accusative
ending is optional, hence why it is written in parentheses above. Choose whichever sounds
better to you in your particular sentences.

Language Note: Remember this is only true when the direct object ends in a vowel.
You could not remove the i in ikranit in the 4th sentence as that would result in ikrant, and
"nt" is not a possible consonant cluster to end a syllable.

Language Note: Regarding the inclusive pronoun forms: the ng that we tacked
onto the exclusive forms comes from nga (oeng essentially means I'm including you in "we"
for example). When one of these pronouns takes an ending (ergative, accusative, or dative),
the a reappears in place of what you would expect (See the 3rd sentence above: oeng-al, not
oeng-ìl).

[Unilsrewtu]

Oh okay I think I get it now So what other suffixes can be put on Oe and what do they do?

[MIPP]

Oh okay I think I get it now So what other suffixes can be put on Oe and what do they do?

It deppends. If Oe is:
* a subject: you use the ergative as i said before (-l) - Example: Oel yìm poti.
* a direct object: you use the accusative (-ti ot -t) - Example: Ayfol tsame'a oet.
* an indirect object: you use the dative (-r or -ru) - Example: Nga lu yawne oer (you are beloved to me [the dative literally means "to whom?"])
* when something belongs to you: you use the genitive (-yä) - Example: Oeyä kelku (my house)

You can find it all at Na'vi in a nutshell.

[Unilsrewtu]

Oh okay I think I get it now So what other suffixes can be put on Oe and what do they do?

It deppends. If Oe is:
* a subject: you use the ergative as i said before (-l) - Example: Oel yìm poti.
* a direct object: you use the accusative (-ti ot -t) - Example: Ayfol tsame'a oet.
* an indirect object: you use the dative (-r or -ru) - Example: Nga lu yawne oer (you are beloved to me [the dative literally means "to whom?"])
* when something belongs to you: you use the genitive (-yä) - Example: Oeyä kelku (my house)

You can find it all at Na'vi in a nutshell.

Alrighty then, irayo. I printed Na'vi in a Nutshell and have been studying it, but for some reason it's easier for me to understand the concepts when someone explains them to me.

Eywa lu hu nga.

[kewnya txamew'itan]

* a subject: you use the ergative as i said before (-l) - Example: Oel yìm poti.

Only the subject of a transitive verb, the argument/subject of an intransitive verb is unmarked.