Once you have your Market, you need to use it as a guide to what sort of Wager needs to be made, if any.

SHEPPARTON Race 6

8 BAHMAN BALE $2.6
2 KEEP ME COVERED $3.2
5 SON OF LORIAN $6.5
3 KID OTMAR $15
1 PRINTER DELIGHT $25
4 ROYAL CONTESSA $25

Only 3 Chances of figuring here.
And only 2 of winning.

So in this case, a Win Bet is good if either of the top 2 selections are Overlays.
And an EXACTA is also a good bet.
The Exacta will be somewhere in this lot.
8,2 - 8,2,5

7 COONEY'S MEDAL $3.2
3 JACK FITZ $3.5
6 RIDDLE BALE $6.6
1 INFURIATION $6.6
4 DIMON DEVIL $12
5 MEGAN DELIGHT $50

Too many Chances here so the best bet would be a Win Bet on the animal available at the Biggest Overlay.
Perhaps Boxing the 3 animals that are Overlays in a 50 cent Quinella is also a good idea.

But the BEST idea is to skip this Race.
If I could, I would.

Another excellent idea would be a Daily Double of 8,2 - Field for 50 cents.
And another $4 Flexi Quad if allowable would be Field - 8,2 - Field - 7,3

So much for that!!

BYE

1 SHIMAGUNI $1.4
6 SKULL WHEEL $7
5 KURNAI KING $12
7 PURE CITY $25
3 DONNA MATRIX $50
4 CELLAR DOOR $150
8 SHANLYN SPARKLE $250
2 MIDORI STORM $300

Hoping it pays something more than the outlay
Flexi-4 for $5 worth
1 - 6,5 - 6,5,7 - 6,5,7,3