At the moment you can only place market orders. Limit orders are on the Freetrade roadmap for sometime this year (3-6 months away it currently says).
I haven’t heard of any plans to add an option for candlestick charts. Freetrade have a section on this forum to suggest ideas, though. Candlesticks have been suggested a number of times, but this one has the most votes currently, so maybe add an upvote there 