The most important thing is to start consistently, not the amount of Bitcoin. To start any investment, you should first have money, sufficient knowledge, or absolutely perfect market conditions.
There is no such thing as perfect market condition for Bitcoin because Bitcoin is a volatile asset. You are new to this thread so it is fine to make the mistakes in your comments. To make things easier for you, do this simple thing: whenever you have some money such as salary or any form of financial inflow, the first thing you should do is to remove the money for your basic needs and after that you will now be left with your discretionary income. From that you can then invest part of it in Bitcoin and keep part of it as emergency funds which you will need should there be any urgent need which you did not plan for.
Don't worry too much about or pay attention to market conditions or Bitcoin movements. It's better to know and understand Bitcoin's track record, as this will motivate and encourage you to continue accumulating more Bitcoin to generate profits by making Bitcoin a long-term goal.
And, as many say, always use your discretionary income after prioritizing basic needs and other essentials. Additionally, you should strive to set aside an emergency fund, which is crucial for keeping your Bitcoin intact. When an unexpected financial emergency arises, your emergency fund will protect you and your Bitcoin.