hey there again

Actually, idem/ideš are from the verb ići which means to go. To eat is jesti, which conjugates as jedem, jedeš, jede, jedemo, jedete, jedu

Also, you really don't need sada in there since it's already clear in the verb that you are doing it now. If you really want it for emphasis though it would be more natural sounding to say "sada jedem jabuku"

(The object needs the accusative case)

što/šta jedeš?

na žalost, nemam vremena jesti.

Words like još, sada etc tend to come earlier in the sentence. Unfortunately, I don't know what this category of words is called so it's probably not much help. :\

"Koliko možemo da idemo"
ne znam...

"Ne hoću raditi ništa još."

This sentence has a few problems. The first problem is that ne hoću is not the correct negation form. Rather, it should be neću.

The bigger problem though is that this sentence sounds more like you are saying ''I won't do anything yet'', because htjeti/hteti followed by an infinitive verb is how you form future tense.

To remove the ambiguity, it is better to use želim in this sentence. So a better sentence would be more like "Ne želim još ništa raditi"

Hmm...I guess the word order is quite a bit different afterall. *shrugs*

Also, in Serbian you would use Volim da volim to say "I love to love", but in Croatian you use Volim voljeti. People will understand either one but those are the preferences.