Anyone can't say Ideal amount, If you are new to space its better to start with 100$ and get used to charts and TA + FA (TA - technical analysis , FA - fundamental analysis).
and after a month or two Strat with amount that can make you profits, 2000$ or more is better for me.
Leave some profits for long term you will get massive 50x 60x returns in 6months to 1 year period for some good coins.

That's my strategy.
If anyone have a better option please comment.