"I have read project description carefully"
I suggest a 10 hour testing period with a rate of 6 $ an hour or alternatively, I charge between 2 $ and 6 $ for a 450 word article (this price varies in relation to the topic and structure of said article). I can provide academic level work in some niches, thus the variation in price. But for a more solid user building strategy I emphasize on the first alternative, this can let me do real research on the likes and dislikes of your user base so I can constantly adapt to their needs and evolve a long term strategy on which I give constant feedback and reports.