I have two main things to say, the first is some constructive criticism and the other half is how you might go about this

1: You seem to be asking for free work and not help on something you don't understand or cant figure out how to do

2: This question is more of a request and is very broad, infact even if we would do free work we wouldn't have any idea where to start because you have provided very vague details

In the future, please provide these details:

These aren't official rules as I am a mere user but in general this is what you should include to have a good question people will want to help answer:

- How experienced are you with what you are trying to do? (optional, but very helpful)

- What's going wrong or what do you not know how to do?

- What have you already tried?

- What are you trying to do? (Give lots of details)

- Are you trying to fix a bug or problem, or are you trying to figure out how to do something?

- In what way are you expecting help? Do you think you have provided enough details for people to understand what you are asking for?

And finally:

- Remember unless it's a minuscule question, generally you should expect to hear how to fix the problem from an answer, not a complete solution. You may receive pieces of code and an explanation instead of a full solution.

____________

Now onto your question:

Based on the way you provided not just vague but hardly any details, and how you worded your question, it seems like you are either:

a): New to Lua or ROBLOX / Inexperienced

b): Are not a complete beginner and have some knowledge, but were referring to a "cash" value on the built in leader board in ROBLOX.

Now if its a, please read about:

Variables

Leaderboards

Tutorials

If it's b, then I suggest you make another question with more details, but still do some reading.