A number of large ice and inline hockey companies have produced great videos on everything from how to select the right gear to product reviews.
There will always be conflicting advice on what is the 'best' equipment size and fit. Definitely talk with the more experienced players in the club about choosing the right gear.
Second Hand Gear
Most of the time there will be second hand gear available, particularly coming into the Summer months. Kids will generally be outgrowing their gear quickly. Again have a talk with other club members.