I feel like it's more manageable in text form. Assuming I haven't messed it up, that is:
............. Across
....①..②..... ③ Crisscrossing
.③④##..#.⑤... ⑥ Do whatever you want
..#.#..⑥###.. ⑦ Winner writes the history
..#.⑦⑧##.#... ⑨ Trespassing
.⑨#..#...#... ⑩ nonsense
...⑩###.⑪###. ⑪ Looking for trouble
...#.#...#... ⑫ Before the army can move
...#...⑫###.. ⑬ Never say no
...⑬⑭##..#.⑮. ⑯ busy traffic
....#....#.#. ⑰ late bloomer
..⑯###..⑰###. ⑲ Want for nothing
....#.⑱....#. ⑳ Don't do things to people you don't want to be done to you
.⑲###.#......
....⑳####㉑##. Down
......#..#... ① A big mistake is made
............. ② Become a bandit
④ Recklessly run around
⑤ To do a good job, you must prepare your tools
⑧ King among Kings
⑩ Make things up
⑭ Better be independent
⑮ die for a cause
⑱ buried talent
㉑ give as charity
And here are the hints in both traditional and simplified.
............. .............
....大..#..... ....大..#.....
.##交#..#.#... .##交#..#.#...
..#.#..为###.. ..#.#..為###..
..#.##败#.#... ..#.##敗#.#...
.#撞..#...#... .#撞..#...#...
...###谈.##生#. ...###談.##生#.
...中.王...必... ...中.王...必...
...#...#草##.. ...#...#草##..
...###应..#.#. ...###應..#.#.
....人....#.#. ....人....#.#.
..#流##..#器##. ..#流##..#器##.
....#.#....仁. ....#.#....仁.
.##无#.才...... .##無#.才......
....###欲####. ....###欲####.
......#..#... ......#..#...
............. .............
Ordinarily at Puzzling.SE, hints are not given until after giving people some time (maybe a week). If someone can figure it out without a hint, then hints are not necessary.
Beyond this, it'll need a title that's more meaningful than just "idiom crossword", which should indicate the commonality between the answers.
I also recommend adding some idea of the level of this puzzle: how hard is it? It looks hard to me.