Front side fins are better if asymmetric. Rear ones can be symmetric for smoother turns, or asymmetric for more hold, or in between.
But for mastering the row, I guess anything works as long as they are big enough, and with a long base.
On C-Drives, I would advise twin fins in front,
http://www.cdrivefins.com/categories/TWIN%252dFINNER/
and the rest according to your weight:
http://www.cdrivefins.com/pages/Sizing-Guide.html
Big C-Drives on the rear will counter the row even more, but will be too big once you get on the wave and want to turn.
Do not hesitate to mail troy (owner of C-Drive) if you want to mix fins of different sets, he can arrange any kind of order.
Normally for 64kg you should get XS front and QS rear... once you get your paddling technique OK for the row.
In the gong shop, the FCS FIN M5 XC QUAD should be good (Or scarfini H1 once in stock) for when you will have the board wired
I would complement them with either a SCARFINI FIN HX TWIN + TRAILER or FCS FIN PC M.R TFX TRI FIN set, so that you could use the big twins in front + the center trailer, and for the quad rear boxes either the front or rear quad fin set
On Gong boards, you can put too big fins in front without too much problems, but too big in the rear will make the board "track" (board want to get flat again in mid-turn). Not an issue in the firt sessions, of course, but better have a proper set available for oince you will master the board.
And, of course, avoid hitting the bottom with big fins...
