"Slog" is a very funny choice of word, and not usually a verb. It means difficult work.
Do you mean, "I find it difficult to write sentences"?
I see you're already using Notebook, so that's a good start. Also, make notes of sentence patterns, eg. "to find [something] [adjective]" or "to find it [adjective] to [verb]."
I find writing sentences difficult.
I find it easy to speak instead.