Kara again

Having trouble using kara it seems. I've translated a sentence into Japanese and need someone to check it. Sorry to keep asking >_<

I will not drink coffee. (It's) because I drank coffee in the morning.

Koohii wo nomimasen. Watashi wa asa ni koohii wo nomimasu kara.

Thank you!

It's better use "Watashi wa" in the first sentence, not the second one.
"Asa ni" is not incorrect, but "ni" is usually not used.
You don't need to say "koohii wo" twice. That sounds repetitive in Japanese, since it's obvious from the context.
And this is the most important; "drank" is past, whereas "nomimasu" is present/future.

Thank you. Seems I forgot the tense of the last nomimasu. Thanks for marking I'll make sure to take it on board