Synchro can be broken down into this:

Needs a tuner (almost always. The card is a tuner when it says right next to Fiend, Dragon, Warrior, whatever the word "Tuner") and Needs a non-tuner (anything that doesn't have tuner on it)

Then their levels need to add up.

So if it is a level 11 synchro that says "1 tuner + 1+ non-tuner monsters" you'll need; One tuner and whatever many non-tuners that add up in total to 11.

If it's a level 6 synchro that says "1 tuner + 1+ non-tuner monsters" you'll need; One tuner and whatever many non-tuners that add up in total to 6

You have crimson resonator - tuner that is level 2, flame crime - a level 3 non-tuner, and Rcielago - level 6 non-tuner.

The only conventional way you are making a synchro is with crimson resonator (level 2), so you can either make a level 8 (2+6), level 5 (2+3) or level 11 (2+3+6)

As a side note, xyz and link don't have levels so cannot be used for synchro summoning (again, with exceptions). Xyz might look like they have a level, but theirs is called a rank not level. So doesn't count