Good team

seems pretty good as SSJ Bardock buffs saiyans he switches out from n whanot so that hits almost the whole team. SSJ God Goku red is strong, but doesnt provide a z-ability to match, so maybe swap with the red Broly character if you have him totally upgraded as he would synergize well with purple SSJ Broly. Lastly, I lost freiza as a unit and as my favorite character, but he has no synergy on your team, and goku black atleast has the saiyan class besides buffing goku black. I would swap him out for SP Bardock Green or another green unit to remove the lack of colors. Unles you want to only buff yellow and blue strongly and have weaker team synergy. If you want to keeop buffing yellow, I would swap frieza for SP SSJ Vegeta yellow, as he complements your team much nicer and it buffs almost everyone.

I mean, cannot tell you to much to add or remove if we can't see your SP's xD

So the problem I see with your team, is that it looks like you've just thrown in some units you have, without a real big reason on why to put them toguether.
If you want more insight on team building, there's guides for it here, but basically when you form a team. You need to forget the team as 6 units. You have to think as 3, because that's what you'll bring into battle. doesn't mean that you can have situational units, but most of the time you shouldn't put them in, if they don't have synergy.
When you go into a match, the Z-Abilities that will be active, won't be only the ones from the fighters you brought into the match. The 3 you leave behind still are active, that's why you'll want the other 3 units, to buff your main fighters.
So taking this into account.
I think the best team you can make is:
Core(This being the 3 main unit that you'll battle with): SSJ Broly/SSJ Bardock/ Godku
Bench: Bardock/SSJ Yellow Vegeta/EX Blue Raditz
So I'll explain a bit here how the team building worked here, so you can make up teams yourself in the future.
Basically first of all you want to focus on a tag. This game as of now, is not super rich on tags. So for this we have Saiyan/Super Saiyan. All of the units in the Core are saiyans, and 2 of them are SSJ(Godku doesn't count because the tag is only for Super Saiyan 1, f. ex. PUR SSJ3 Goku, has the tag Super Saiyan 3).
So you want to search for a bench that buffs your units tag, in this case saiyan, so you have to look for units that buff that tag with their Z-Ability.
Normally you want to have, one unit buffing strike, and another buffin blast, and the last one buffing health.
In this casse we have selected Bardock in specific because he isn't there only for buffing. Bardock(GRN) is a pretty solid unit, so we want him there both to buff, and to bring him in, when you need him(maybe the enemy has a strong blue unit, or a full blue team f. ex.).
SSJ Yellow Vegeta is an exception, he doesn't buff saiyan tag, but super saiyan one. That means that Godku doesn't get buffed, but because he buffs blast, is not the biggest issue, and it's pretty good to buff Broly's critical.
And last Raditz is there to buff health.
So, the 3 units in the bench, normally aren't for bringing into battle, there are exceptions obviously, like Bardock in this case. But in general they only are there to buff.

And just before ending, the last thing, in this case I removed black, not because he's bad, but because I personally prefer godku, and having both of them is not the best because you want to always have SSJ Bardock and SSJ Broly toguether in battle. They work really well toguether, so you would have to remove one buff from the bench, and then neither of them buff saiyan, so it wouldn't be good. But you could take out godku and put in Black, I just prefer godku here, because his stats are more balanced, and because he can deal with the yellow units that the enemy brings to deal with Broly.

Sorry for the wall of text, but wanted to try and explain it as well as possible, hope I helped.

Ps.: If you still have doubts, there's guides in this web that explain how to team build.