My home is Bangladesh. I am from Saudi Arabia for work. I want to come to Poland from here. What do I need? How much money will it cost? I will give it to you. Will you help me?

As a Bangladeshi citizen working in Saudi Arabia and wishing to travel to Poland, your legal status depends on the purpose of your trip (tourism or business).
What do you need?
You must apply for a Schengen visa (C) for a short visit of up to 90 days, or a national visa (D) if the purpose is business or a long-term stay.
As a resident of Saudi Arabia, you must have:
A valid Saudi residency permit (Iqama + exit/re-entry visa)
A valid passport
Schengen health insurance
Proof of employment and income in Saudi Arabia
A confirmed accommodation and flight reservation
A bank statement
A document proving the reason for your trip (business or tourism invitation)
Cost:
A long-stay Polish visa (D) costs approximately €135
A short-stay Schengen visa (C) typically costs around €80
(Consular fees only, excluding insurance and travel costs)
Can someone help you for money?
Legally, no private entity can "facilitate" or guarantee a visa. The decision rests solely with the Polish consulate, and only the official fees are required. Any intermediary requesting additional fees is a potential scam or a risk.
In summary: You can apply from Saudi Arabia if your residency permit is valid. The basic cost is €80–€135 depending on the visa type. Yes, a lawyer or immigration consultant can help you prepare your application, but no one can guarantee or expedite the visa process outside of official channels.