Currently, I am saying the Morning Offering, 3 O'clock Divine Mercy Chaplet and the Evening Offering as my starting point. The Rosary might prove too much for me at the moment and I fear I will give it up halfway again.

You should read Fr Fortescue's book The Orthodox Eastern Church. It's hard to find in print, but some independent publishers will make reprints of it. I'm in the middle of reading it currently, and I've learned a lot about the history of the Eastern schismatics. Fr Fortescue masterfully points out the errors at the root of the Eastern schismatics, namely their propensity for wanting to involve the secular state in everything religious rather than the appropriate ecclesiastical authorities and their blind, irrational hatred of everything Latin/western.

I just finished reading the part about the Photian schism. I think if you read that section, you will have no doubt that the Catholic Church is the true Church of Christ and not the Eastern schismatics. And if you read before that the history of the see of Constantinople illicitly increasing its importance from backwater nowhere to "New Rome, second to Old Rome" (while also swallowing up the rightful places of actual apostolic sees), you can easily see that it is a sham of a church.

Furthermore, the Eastern schismatics have no objective principle for determining what councils are ecuмenical. As a whole, they have no objective way of discerning theological truth. They have no way to objectively resolve jurisdictional disputes at the highest levels, so naturally the state gets involved.