Be sure and separate out your Account-level data for an Accounts import.
Splitting First and Last Names:
First name Column =LEFT(C2,SEARCH(" ",C2)-1)
New Last Name Column =SUBSTITUTE(C2,LEFT(C2,SEARCH(" ",C2)),"")
Don’t forget to give the Deals a name. The Deal Name is a mandatory field for import.
Ensure your stage values match the options in your CRM.