Importing list from Leads to an email campaign

Importing list from Leads to an email campaign

Hi all,

I wonder if someone can advise me as I am new to Zoho and learning fast!

I have just imported to Zoho CRM a list of 1000 potential clients into the Leads section.

How can I use just this list to add to an email campaign in Zoho Campaigns?
When I try to sync Leads in the Campaign module, this list is empty?

If any one can give me a step by step guide I would be grateful!

Many thanks
David