Hi Mad Gambler and welcome,

I will try to answer your question but i am no expert so beware.
The things i would look for are class, fitness, form, track conditions, distance. Then perhaps consider barrier position, jockey, trainer, strike rates, prize money and weight allocation and finally i would have a sqizz at the betting market to see what others think are the main chances but as i said i am no expert. I suppose you are looking for factors to support your selection but also looking for weaknesses that may tell you that another horse is better suited. All this info is in form guide so i guess it's what you decide to do with it.

Does that make any sense?
Best of luck