Starting Bitcoin investment with little capital will be very challenging mostly if that happens to be the major survival option of the investor. And in cases where the investor plans on using the proceed to solve their needs they might end up selling when the price have dropped just to settle the pressing need of that time.
As experienced investors are there measures that can be imbibed by new investors with little capital to help boast their capital. Some will want to mention patience which I will agree to but in situations where the money is needed to meet an emergency need how to you tackle such situations. Your formula might be a saving approach.
If you have little money and overwhelmed with much problems and you plan on using it to buy bitcoin, then don't. You know why? When you have a little challenge tomorrow, you will undoubtedly sell the bitcoin and selling the bitcoin is not my problem but selling it a loss is even the worst thing a potential investor should try to do. Instead of wasting the capital or to make it becomes choppied, use it to solve your personal problems.
On the other hand, if you little capital and but will not be touching it anytime soon, you can buy as much as your capital can get but a quick reminder, your capital will determine the amount your are going to make even if bitcoin should do 10x from your buy target price. That said.
Whether you plan to buy small bitcoin or in large chunk, do DCA also know as dollar cost average where you buy bitcoin in split as the price drops lower and lower so that you will have your price average with little to no loss by the time you have bought all bitcoin your money could afford. After that, look for a secured wallet if possible a hardware wallet and keep everything there and make sure that the seed phrase is properly back up in different location, just for safety reasons and then you are good to go.