If your friend told you not to go into business because you need "water" and if he thinks "water" is wealth in general, then you can ask him to fly kite.

It's true you need water because your 八字 is full of 比劫 and hence should 洩, and water seems to be your 用神。(please check with others regarding this).

金生水，you are 辛金 so water helps。 And also 水生木。我剋為財。

Also in your 八字，you have both 食神 and 傷官。食傷生財。Furthermore you also have 偏財in your pillars.

Now it depends on your 運。丙辰 should be good for you, and the next 乙卯 should bring wealth.

However it also depends on the kind of business you are doing. Destiny aside, we can discuss about the prospect of your business and the environment you are operating under.

All the best.