There are numerous threads on this topic from the past. One word of caution is that not all things are as rosy as they might appear at first sight. This is especially true of EagleJet, sometimes there are instances where 'observation' flights are the norm and you're not sitting in the RHS during a flight! Others are combinations of the 2 where you do some RHS flying and some observing, etc resulting in fewer hours per month. At that rate it will take you far longer to complete the alloted hours and also struggle throughout without on proficiency.
From what I gather the Airbus programs are the ones you need to get into. Ryanair has an ocean of Boeing 737 pilots with hundreds of hours ready to move onto other airlines. Therefore getting eaglejet time on a Boeing isn't as lucrative as Airbus time at the (moment).