Break down the talent vision for your child, your parental vision, as big and blurry a cloud as it may be today, down into smaller objectives that are nearer to earth and that can be concretely reached at an earlier age.
If you sense that your child’s long term talent after the age 0f 18 will have an engineering bent related to it, then you will want to start coming up with intermediate objectives that you can reach by the age of 16 (perhaps finishing Calculus). And in order to reach those objectives by age 16, you will want to set even still smaller goals now for him to reach by age 14 (perhaps participating in local math clubs). When you have reached the age 14 objectives, perhaps new and even better opportunities will emerge by that time that will allow you and your child to come up with more specific long-term talent goals than just vague engineering. Perhaps by age 14, a fascination for how telescopes and microscopes work will have grown to such a point where you both agree that he would do well to now focus more narrowly on the science of optics instead of engineering science in general.
