I am a convert to the Coptic Orthodox Church. I was originally a Protestant, but I spent a year preparing to join the Catholic Church before being shown the Orthodox Church.
If I might address the issue of Saturday vs Sunday Liturgy (disclaimer, this is just my opinion, and of course it is better to take the advise of a priest if you can):
In the Catholic Church, Sunday is a day of obligation, meaning that it is considered a mortal sin to miss Sunday without a valid reason. I'm wondering if this is what you are thinking of when you ask if it is considered the same Liturgy? In the Orthodox Church, as you're probably aware, there is no concept of days of obligation or even or mortal vs venial sins.
This doesn't mean we can just skip Church on Sunday. We should respect Sunday as a commemoration of the Resurrection. However, if there is a valid pastoral reason to go a different day instead, then that isn't considered a sin. Normally a person would make such a decision under the direction of the Father in confession (spiritual guide), however, since you don't have that type of relationship with a priest yet I think most people would consider it a reasonable decision considering the distance you have to drive, and your need and your children's need to participate in a language you can understand.
What is more pleasing to God? For you to go on Sunday because it is Sunday, and not understand anything, or to go on Saturday instead, but to understand? Especially if you are taking children, it's important for them to be able to understand and learn. For another example, in Egypt, Sunday is not part of the weekend, it is like Monday here. Most people have to work, so more people actually go to Church on Friday because that's the day they have off. It is unfortunate that this is necessary, but it is reality.
Now, if you do go on Saturdays you miss out on the Sunday cycle of readings (although if you go on Sundays, you miss out on it too since it's in Arabic). But you can easily read the daily readings, and even pray the Agpeya (book of canonical hours) at home as a family on Sunday if the only available English Liturgy is on a Saturday. The readings for the day are always posted on this website in NKJV: http://copticchurch.net/classes/getLectionary.php
, and you can download the whole lectionary in PDF in KJV here: http://www.stmaryscopticorthodox.ca/publications/lectionary/lectionary.html
You can download the Agpeya and the Liturgy book here: http://www.stmaryscopticorthodox.ca/publications/servicebooks/servicebooks.html
If you need help with navigating the Agpeya or any other questions like that please feel free to ask.