You are not going to get exact figures from anybody here, but in general terms, you'd want to start small as a beginner, that should be the default idea. If you go in with a lot of money, you can lose it quickly, yes you could also lose it quickly if you have been trading for a long time too, but then you are expected to have learnt risk management strategies and apply them accordingly.
Start with what you can afford to lose as you learn the ropes. If you are also going to be trading with leverage, then use small leverage. Don't let the idea of higher profits deceive you, because the market could go against you and you get liquidated.
A safe start is with small money, small part of your whole finance because as a newbie, you have a lot of things to learn, experience, mistakes and losses to get so with small money you will have small loss that is acceptable. With time, and several mistakes, some losses, you will gain enough knowledge and experience, it will be time to use bigger capital for your practice such as trading.
But there is another principle, never use too much money, too big percent of all finance for trading, as trading is risky, and it is not safe to use big part of your capital for trading. The big part of your capital needs to be spent for investment: buying bitcoin, DCAing bitcoin, and holding bitcoin a long time.