Computers/laptops are mostly commodity items these days, but there are specific features you should look for related to video editing. Some basic guidelines for HD video editing include:
- SSD for storage: 500GB to 1TB; SATA interface is OK, but M.2 preferred at 4x the bandwidth)
- Minimum quad-core processor (high-end Intel i5 or i7)
- 8GB RAM (the more the better)
- Discrete graphics (AMD Radeon or nVidia); modern NLEs use the graphics processor for rendering
A display that can be color-calibrated will be useful if you're anticipating doing anything commercially.
As far as the software is concerned you can get an amazing commercial-grade NLE called Davinci Resolve from BlackMagic Designs for FREE. The free version has a couple of limitations (none that should affect the ability to edit video from a Spark), but the $300 commercial license removes those limitations while remaining a great value compared to other commercial solutions.
My video editing is strictly for my own use/pleasure, and I'm currently using a 2+ year old Lenovo T460p notebook with an Intel Core i7-6820HQ CPU, a 2TB SATA SSD and 32GB of RAM. The graphics processor is an nVidia GeForce 940MX (the low end of the spectrum) and is quite adequate for decent performance rendering the 1080p/30fps video, titles, transitions, etc. that I produce with Davinci Resolve. I have a 4K Lenovo ThinkVision X1 27" display as my primary, and a pair of Dell 24" WUXGA (1920x1280) as secondaries.
If you're handy, you might consider building your own PC. You can easily build a system that would blow my notebook out of the water for around US$1K, and be able to upgrade it incrementally as your needs change. If I ever invest in a drone that supports 4K, that's a very likely path for me. Laptops don't offer that flexibility.