Put together a list of 1000 sentences using simple vocabulary but varying the sentence structure quite a bit so you can practice translating sentences into your conlang.
https://github.com/drumworkteam/...
Also in that repo are 1000 word lists (1000 nouns, 1000 verbs, etc.), which are simple words to bootstrap your conlang lexicon, derived from multiple places and manually curated / added to to make sure they cover a wide array of things and are useful. https://github.com/drumworkteam/... Going to add 10-word lists, and 100 word lists so you could theoretically start with those even-more-meaningful-and-simple words.
Finally there are a few stories in there to translate, some simpler than others, like this one about a fox https://github.com/drumworkteam/...
All stuff is in the public domain and kept simple so you can focus on bootstrapping your lexicon and grammar. We are using it to create a math-oriented modern conlang called "tune", here are some example words https://github.com/drumworkteam/... As we wish for certain things while conlanging, we are abstracting them out into that seed repo with words, sentences, and stories. There were a few word lists out there but not as much as you'd like. It's open for anyone to add to, use, or modify. Feel free to send PRs.
Tone Script