1) so when an infant is baptized, do they somehow accept the vows, although they're too young to speak and look like they're not aware of what's happening?
The vows are accepted on their behalf, by those who have the right to speak for them on the matter.
2) let's say there was an older child who could voice an opinion on the matter. The parents wanted the child baptized, the child refused to be baptized, but the parents had managed to bring them to church anyway. If the child was vocal about not wanting to be baptized/said they did not believe in the teaching of the Church/said no when asked by the priest "do you renounce Satan", could/would the priest baptize such a person anyway?
I'll give an example which is hopefully illustrative...
In the Orthodox Church infants are given Holy Communion. Since they cannot personally sin, small children are communed - parents can freely bring their child for Holy Communion every time they attend the Divine Services, with no qualms about whether or not the little one is properly prepared.
However, at the discretion of the Priest, the child will begin to have to receive confession before communing, or at least examining their conscience in those Churches where this long standing practice (of confessing before every reception of the Holy Gifts) is not strictly put in place. Typically, this is usually at around the age of seven, though there are always exceptions to this (particularly with some children younger than this, who may be more morally developed). Once again, at the Priest's discretion.
What this example demonstrates, is that there is a point where the child begins to become morally culpable, and capable of putting obsticals in the way of their fruitfully receiving the sacraments. Sadly, that means they can receive the Holy Mysteries in a sacreligious manner.
So if we're talking about a little child (say an infant or a toddler), their Baptism is not an issue to be worried about. But say it's an older child (like a ten year old) who for whatever reason has some strong objection to becoming Orthodox, they should not be Baptized.