Hints are (often) not needed
This may sound surprising to you, but puzzles are generally better without hints.
Many hints are added because the OP is impatiently waiting for some response and deems the lack of immediate responses be caused by 'difficulty' of the puzzle. That's wrong. There are many reasons why a puzzle may not receive immediate feedback, and one of them can simply be that it is indeed a very good puzzle! People want to work on it and then present the complete solution.
Give your puzzle time to have some impact
Few things are as annoying as puzzles getting hint after hint within hours (if not minutes!) from their posting. Don't add a hint before you get some request for one by multiple users. If your puzzle is good then it will need time to be solved, and people not always post their work until it is finished. Don't ruin their fun and your puzzle by "over-hinting" it until a crash-test-dummy could solve it!
Just imagine you're solving a puzzle, have spent a couple of your hours on it and feel really proud to have cracked it. Now you want to nicely summarize it as an answer post just to realize that dozens of answers are already there, because the crucial thing of the puzzle has been spelled out in red letters in a "hint". How frustrating would this be?
Also think worldwide: It takes ~24hrs to have 'all regular users' spot your puzzle, simply because they are distributed over all time zones. Also not all weekdays show the same amount of activity, so maybe it takes a couple of days before all potential puzzlers have even seen you puzzle.
Rule of thumb
It is possibly a good idea to wait 'at least 1 day' before adding any hint. Better still: Don't add anything until you've received comments that the puzzle is 'too hard' and ideas would be welcome. Some very good puzzles remained "silent" for months, but people were working on it! If you're not sure, rather post a comment asking "Should I add hints?" before adding them.