You can't make reservations until you buy tickets, and I wouldn't buy tickets this far in advance.
There are three main schools of thought.
1. Some people absolutely feel the need to go to Magic Kingdom first, full stop. These people tend to visit the parks in "release order" (MK, Epcot, Studios, AK), but none of the rest of the order is as important as Magic Kingdom first. They don't feel like they're truly on a Disney vacation until they're strolling down Main Street, USA for the first time.
2. Some people like to try to time which parks are going to be most or least crowded on certain days. This used to matter more when morning Extra Magic Hours for on-site guests used to be 60 minutes at one particular park each day, but now it's 30 minutes at all four parks every day, so a lot of that fluctuation is gone.
I'm here --> 3. Don't bring little kids visiting WDW for the first time to Magic Kingdom first. It will almost certainly be their favorite park, it's the most kid-focused and high-energy, and it can burn kids out and prevent them from enjoying the other parks if it's the first thing they see. I recommend taking kids to Magic Kingdom last, and visiting the parks in reverse-order of kid friendliness.
If I'm you, I'm doing:
Epcot
Hollywood Studios (or Animal Kingdom)
Animal Kingdom (or Hollywood Studios)
Magic Kingdom
Epcot or Hollywood Studios, whichever you liked better or felt like you needed more time in
Magic Kingdom
If you were to get Park Hopper tickets, then I'd go:
Animal Kingdom, hopping to Epcot
Hollywood Studios
Magic Kingdom
Epcot, hopping to Hollywood Studios
Animal Kingdom, hopping to Epcot
Magic Kingdom