Your main saiyan team should consist of sp broly purple, sp Vegeta green and sp broly red. The bench characters should consist of sp ssj goku red, sp Vegeta purple and ex raditz blue.
Sp broly purple should be the first character to start the game with as he has an ability to nullify color disadvantage for a while so he can be on an even playing field. His blast attack is great and when you can use you his main ability, he transforms and gains attack stats surpassing almost all units in the game until the match ends. His main ability after transforming gives an ultimate card, which outputs insane amounts of damage, so it is one of the most easiest main abilities to learn and master for beginners.
Sp Vegeta can deal great amounts of strike damage and has access to plentiful buffs to increase his strike damage and can surpass even broly purple in strike attack if you gather enough buffs. He can also survive lethal damage, recover health back and gain strike attack buff so many players use him to sponge an attack called rising rush, the most broken attack in the game. If you need more health, his main ability restores health and gives strike attack buffs so you can have a unit at almost half health who crazy strike damage when using his ability after a rising rush.
Sp broly red is like an inferior sp broly purple but he is still a dangerous character. He gains damage buffs every time he lands a strike arts card on the opponent and gains double the buff whenever he attacks a goku or Vegeta, which is more than half of the time. Besides that, his main ability gives him a lot of health and an ultimate cards too.
For the bench characters, sp red goku increases strike attack damage while sp vegeta increases blast attack, thus making your aggressive team even more agressive and thus more likely to grab the win. Ex Raditz increases health for all saiyans, thus giving them more survivability to accommodate for any mistakes.
In summary, your main team should have sp broly purple, sp Vegeta green and sp broly red while your bench characters should be ex raditz blue, sp ssj goku red and sp Vegeta purple. It is very helpful for you to give your entire roster of characters but usually, almost all ‘Hero’ characters don’t make the cut for pvp teams so there is little to no need to show them. Otherwise, good luck and I hope to challenge you in the future.