The big yellow one is the sun

[Vawm tsamsiyu]

Trying to translate a Brian Regan quote
apxa rim Fko Lu tsawke 
The big yellow one is the sun

Any help would be apreciated

take luck  Irayo

[omängum fra'uti]

Well for start, apxa doesn't seem to necessarily mean physically big, so I'd go tsawl.  You need to attribute the adjectives.  I'm also not sure that fko would bear quite the meaning it does in English there, but perhaps it could.  The thing with fko is it's very generic, perhaps too much so for naming it as something specific.  You could use tsa'u or tsaw.  Tsaw is nice because, while it's not a rhyme with sun like one is, it's alliterative with tsawke.

Tsawla tsaw arim lu tsawke.

Or you could make it even more fun to say by piling on the tsaws in order...

Tsawke tsawla tsaw arim lu.

[Vawm tsamsiyu]

Irayo. Now if only there was a word for luck so I could say take luck