Collecting the exclusive fragments to level a partner to 30 takes some time, and your Es and Ryoka would suffer due to this.
I suggest you get Ikkaku at level 80 and use him as your money maker continuing to save exclusive frags for byakuya at this time.
Then when you get the sufficient exclusive frags to get Byakuya Exclusive Level 30, recruit him and upgrade him to red quality(when you have enough red reishi).
Then you would have to get him his bonds and upgrade him. You can learn how bonds work I believe as there are several Bleach Online Youtubers.
I also suggest that you save any/all Universal Modify Fragments that you get from events to Modify Byakuya.
Byakuya's 5th mod which is a death mod is very useful in the daily activity known as Void.
Good luck.