Dell OptiPlex 7010 SFF upgrading the SSD

I wish to upgrade my Dell OptiPlex 7010 small Form Factor to boot from SSD instead of the present HDD, what is my best option? to replace the HDD with cloned SSD or keep the HDD and add the SSD as second drive attaching it to port SATA0 in the Motherboard and how? as in this model there is one HDD bay for 3.5" HDD, no bay for second HDD or SSD but SSD is too small and may be left hanging, will also the BIOS detects two HD drives? if any one has upgraded their system to SSD I appreciate their help, thank you