Consider your screen size
After you've selected your screen recording software and determined your plan, it's time record your assets! First ask yourself what device you should record on. A lot of modern laptops or tablets have unusual screen sizes that don't scale so well when you record video. If possible, try to record your screen on a device that is 16:9 ratio and at least 1920x1080px dimensions.
Pick an approach
When recording your screen, it can be difficult to stick to your script. There are a couple of approaches to take.
Memorize your script and shoot in one take
This approach usually yields the most natural results. If you record your screen and microphone simultaneously, you can instruct the user as you would in person and show them whatever you need to on the screen. You might not stick to your script 100%, but you can always edit parts out later. however, if you're not comfortable editing video, this approach can lead to lots of re-recording, which can be time consuming.
Record your script and screen separately (best for Spark)
Another option is to record yourself reading the full script using your preferred app and then play it for yourself while you then simultaneously record your screen and follow through the actions. If you're planning on using Adobe Spark, this is the ideal approach. Just record the screen performing the actions you need to show users and then you can do a better voice-over in Spark later. Be sure to take your time while performing the actions on-screen!