Newbie blader, need suggestions

Hello, my kid and I are new to beyblade. We have scoured numerous malls and purchased a few beys. My kid wants to join a tournament in our local toy store which will be held in a few weeks. I just have no clue on which combinations he should use for the tourney. We have been trying for a bit but our collection isn't big enough to get a definite combination. So, if its allowed, I would like to take in some suggestions on combos based from the beys we currently have.

Deathscyther oval accel b-12
Beast behemoth h.h. b-63
Xeno xcalibur m.i. b-48
Dark deathscyther vertical gyro b-61 07
Psychic phantom 6cross spiral b-80 05
Alter chronos 6meteor trans b-82
Legend spriggan 7mr b-86

So far, alter chronos 7meteor trans had worked best from our tests.
I can kinda confirm alter chrnos 7meteor trans is our best bet, now we're figuring out a combination that uses the Accel tip for an attack type combination
This is not the right thread to post combo suggestions. Here is the link to the thread you should post on: https://worldbeyblade.org/Thread-Build-m...pid1415125
What will be the price for dragoon Msuv green version?

Suggestion pls
Alter Chronos.7C.G (Solid defense combo)
Legend Spriggan.H.T (This combo can be used in both Left and Right mode, but right is way more powerful)
Legend Spriggan.7M.A (Use this combo in only right spin)

You can check out different part's stats and their competitive use on the Beyblade wiki. Just press More on the top row and press Beyblade Wiki http://beyblade.wikia.com/wiki/List_of_B...kara_Tomy). You can search up combos and how good products are