You need to set an alert using "Send Alert" flow step to any action that you want (Lead was created, lead filled out a specific form, lead clicked on a link etc...). You need to enter sales email address to "To Other Emails" (See below)
You can use "Add choice" to segment who you want to send the emails to. For example: If a lead was created from Eastern US, send alert to SalesRep1@yourcompany.com,SalesRep2@yourcompany.com. If a lead was created from Western US, send alert to SalesRep3@yourcompany.com,SalesRep4@yourcompany.com etc...
As long as the lead is owned by a queue, lead owner information will be blank (name, email, phone), so it's not relevant to send alerts to the lead owner from Marketo.