It's so important to maintain a consistent look throughout your marketing collateral to establish your brand identity. This excellent blog post has some essential branding tips for anyone starting up a business or thinking of rebranding:
They ask some searching questions to help you evaluate exactly where you are as a brand, and go over four key criteria:
1. Understanding your mission
2. Setting up a brand style guide
3. Creating easy-to-use processes
4. Using branded links
If you need to get your brand organised it's a great place to start.