I am switching phones and already have some contacts on the new phone. Will exporting my old contact list delete the new ones?
No, the application won't delete the contacts. However, the best way to export the contacts is through the VCF export option. Use the MCBackup application and export the contacts as VCF, then email that file on the new phone and import the contacts. What you already have will be imported and both of your contact lists will be displayed.
For additional help, access the Play Store link that will lead you to the application: https://play.google.com/store/apps/details?id=com.globile.mycontactbackup