Here's a suggested database schema to store customer information and track invoices:

```sql
CREATE TABLE customers (
  customer_id INT AUTO_INCREMENT PRIMARY KEY,
  name VARCHAR(255),
  address TEXT,
  phone VARCHAR(255),
  email VARCHAR(255)
);

CREATE TABLE invoices (
  invoice_id INT AUTO_INCREMENT PRIMARY KEY,
  customer_id INT,
  invoice_number VARCHAR(255),
  date DATE,
  item VARCHAR(255),
  amount DECIMAL(10, 2),
  paid BOOLEAN DEFAULT 0,
  FOREIGN KEY (customer_id) REFERENCES customers (customer_id)
);
```
In this schema, we have two tables: customers and invoices. The customers table stores information about each customer, including their name, address, phone number, and email address. The invoices table stores information about each invoice, including the customer it is associated with, the invoice number, date, item, and amount. Additionally, we track whether the invoice has been paid using a paid field, which is a boolean value (0 for not paid, 1 for paid).

The customer_id field in the invoices table is a foreign key that references the customer_id field in the customers table, indicating the relationship between the two tables. This way, you can retrieve all the invoices for a given customer by joining the two tables on the customer_id field.
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