1. yes, we do. and also you can attend the church whenever you want, on Sunday there is divine liturgy, which main purpose is that bread and wine transform into body and blood of Christ and believers receive them, for heal Thor souls.
Eucharist is union with god. It?s not symbolic, it?s mystical and like other sacraments, the Eucharist can be done by bishops and priests, with special prayers, when bread and wine transforming into body and blood of Christ. (sacraments aren't created by Orthodox. they are created by god. and gave blessing to apostles to materialize them, and apostles - to priests and bishops. sacraments are ancient, you can read in acts or in Epistles of Apostles, but protestants deny them)
The apostles received the first Eucharist from Jesus Christ on The Lord's Supper.
?? Jesus said to them, "I tell you the truth, unless you eat the flesh of the Son of Man and drink his blood, you have no life in you.?? ( from John 6:53)
2.
there are different services. the main is liturgy.
3.
they pray of course

and this prayer has much big power, than when you pray alone, because you worship with many people, with them you are united in christ. brothers and sisters in Christ worship Jesus, and he is unvisibly among them

(''For where two or three gather in my name, there am I with them.? mat. 18:20)
4.
no, protestantism was against catholic church and it was born in schism of Roman church, not in Orthodox church, because of crimes of Catholic hierarchs. yes, protestants were against these crimes, BUT they created new and foreign doctrines for Christianity, created their own churches, which arent built by Christ, and started to teach blesephemous teachings.
their theology is very low.
Martin Luther wanted relationtip with Orthodox and he sent letter to Patriarch of Constantinople, but Patriarch didnt agreed, because he denied holy dogmas and had new and foreign doctrines and catechism for Christianity.
P.S
Maria S. actually the roman church is in schism, because they added fillioque to creed, and they started to use other creed. yes, many saints believed in Fillioque BUT it wasnt officially proved by whole church, so it was very big mistake to add Fillioque in Creed, when it was forbidden on the third ecumenical council to add or remove words in creed, especially when the Fillioque wasnt proved officially.
also we say that Pope was first among equals, BUT your views are valid canonically.
than for catholics added popes infabillty. it is foreign for the church, because there wasnt such speech about popes infabillty, infallible are only councils, and we are sure that 100% infallible are only ECUMENICALS.
also you added purgatory, Marian dogmas, Original sin, ''pay a dept to god'' and etc...
so come and recive grace in ORIGINAL and APOSTOLIC church, which is waiting for all of us