Growing grafting trees

I have started a massive number of apple tree seeds. I know they will NOT produce Pink Ladies nor any other apple that they came from but I am gonna grow a couple and see what happens.

The rest of them I am gonna try to grow grafting stock from. The idea is to get 10-15 of them to grow to 2-3 feet tall and then graft plums, apples and pears onto them that fit my climate. Likely Asian pears, my grandmothers plum and some sort of crispy apple, maybe pink lady, gravestine, Fuji or similar trees.

The question are:
How big do the root stalk trees need to be before grafting?
If I was to take 5-6 seed starts and make them grow together would this support multiple different types of fruit on the same root stalk? Should I wait longer to graft onto this one because of the multiple species that I want on it?

Basically that is all I can't find out about doing this so any help would be appreciated. I know it will be 2-3 years before anything is really ready for grafting and another 2-3 before I see fruit but better to plan now.

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