Professional ICO Development Services will typically include everything you need to successfully run a token sale. Based on what I have seen, this includes token development and smart contract programming. They also assist with tokenomics strategy, whitepaper writing, and developing a secure ICO website with investor portals.
Most of them include KYC/AML implementation, payment system integration, and admin interfaces for managing the token sale. Some of them will even assist with exchange listing and post-sale support.
When selecting a service provider, ensure that security, transparency, and compliance are addressed.