Hello Sir,
I understood your requirement and before proceeding, I need some clarification about -
Do you want those gif explainer slides to occupy full-screen?
Can I add the animation effect to text?
Relevant Skills and Experience
I have worked on various prototyping and design tools like Sketch, Adobe experience design, and Balsamiq. So talking about the tool, we can either go by your choice or I can advice one for you.
Proposed Milestones
$5 USD - Rough Wireframe Prototyping
$20 USD - Actual Design By Client Choice
If you need any further assistance related to design workflow or anything else, I'll be always there to listen.