Oh, bless you. There is a lot for you to get your head round there.
Global Delay is a wide, umbrella term which literally does what it says on the tin - a child with a global delay, is delayed in their development in all areas (physical - both fine and gross motor - , cognition, expressive language, receptive language), rather than a child for example with Autism who is much more likely to have what we call an 'uneven profile', with skills more strongly developed in some areas than others.
The fact it is a 'delay' rather than a 'disorder' indicates that, as far as the Paediatrician can predict, they expect them to eventually reach milestones, just later than your "average" child.
Focal seizures The MRI is to try to unpick why these seizures are occurring. Seizures are incredibly frightening for parents when they first happen, but they are much more common in young children than most people would think.
2q13 chromosome deletion is not something I am familiar with personally, though you will see here there are many, many different conditions related to chromosome deletions. You can phone the helpline at Contact for more information and support.
Of course it is a bit overwhelming to begin with 
The hardest time is when things first start. It will get better once you know what you are dealing with and how you can manage it.