First and foremost, a warm welcome to Interconnected!
That depends on your specific sales pipeline.
Intercom has a “CRM style” focused on managing customer conversations.
Depending on your specific Intercom plan, you may also have access to various sales featured offered.
The advantages to external CRM such as Salesforce is the connection to other services outside of Intercom such as drip campaigns and the ability to really fine tune the sales pipeline by adding more customised data, forms, emails etc. As well as reporting on sales data. Intercom works in harmony alongside various CRMs, particularly Salesforce.
Intercom is an excellent first step into the CRM world, and probably extremely suitable for your small startup.
Based on personal experience, Intercom is an excellent CRM for startups looking for a solution that is more lean than a full CRM solution like Salesforce.