Depends if you want to build an STR Cleric or INT cleric.
STR cleric pretty much have two main paths: Monk or Paladin.
If you want to go Monk, you can pick up Priest on the way or Cleric2 and Diev.
If you want to go Paladin, try to at least pick up Cleric2 and either Krivis or Diev.
INT cleric are limitless, mainly hinges on Krivis and Bokor for leveling and later going to Druid, PD, etc.
Dievs aren’t fixed to a build, they’re mainly utility so you can sneak them into any build.
I’m going Monk for no good reason - I just like the way it works though now and then I kinda want to experience pally. I’m also a solo player though at early levels Priest skills are invaluable for dungeon runs. Even a Priest3 can handle lv90 dungeon as a sole healer.
Give us more details on what you want and we can point you to some threads to read Unfortunately there’s not many gameplay videos so the best you can do is just trust your instincts looking at skill names of the r5-r7 classes.