How do we develop

We are a small team of 3 members
We develop games in spare time.
...
We do not have the funds, unable to recruit staff.
Should we find angel investment still continue doing?

That depends on what your goal is. It sounds to me like you are not trying to get jobs in the game industry ("jobs" is the purpose of the Breaking In board, where you posted originally). It sounds to me like you have some sort of business goal. What you need to do is to decide what your business goal is. Then you need to work out a business plan.

[size="4"]ok~~thanks~
[font=arial, ??][size=2][size=2]we will try to[size=2] commercialization.[/font]

[size="4"]ok~~thanks~
[font=arial, ??][size=2][size=2]we will try to[size=2] commercialization.[/font]

Okay, now you need to think about what commercialization method you want to pursue, research the specifics, apply them to your situation, figure out what you need, how long it'll take to become profitable...
Write a business plan.

First step is always to create viable business plan, as Tom said. Furthermore, create an overview of how your games so far have performed and see what you need to expand in order to generate greater revenue and/or move into a different market.

You might also want to get someone to handle the business side of all this if you don't feel that you are qualified; trust me, it will most definitely suck time away from development!