For a goalkeeper his most important piece of equipment will be his goalkeeper gloves. Goalkeeper gloves come in various styles, sizes, brands and quality. When choosing a pair of gloves ensure to get a pair that fit comfortably and are not too big. If possible try the gloves on before you buy as different brands may come up slightly different in sizes. As for the type of glove, it all comes down to personal preference.
The original 'flat palm' glove will give you a good all round performance.
The 'roll finger' cut palm will give a tighter fitter and more padding to your fingers.
The 'fingersave' will help protect from injury and stops the fingers from being bent backwards, but it may not be as comfortable as the previous two types. From personal experience I have also had to buy a larger size glove when it comes to fingersaves to give you that bit of room for movement of the plastic strips.
The 'negitive cut' has the least amount of latex on the fingers but because of the way it is sewn it is suppose to give you the best grip for catching crosses.
You may also get a glove with a harder palm which may not be made of latex, these are used on harder surfaces such as astroturf or concrete and should last longer then a regular latex palm but it wont give you as much grip when catching or handling.
One of the most annoying aspect of goalkeeper gloves is the longevity of them. When first worn they can start to wear away after contact with the ball, to help preserve your gloves ensure to watch them after use with luke warm water and some watching powder or washing up liquid. Work the glove into a lather and make sure you rinse thoroughly and hang up to dry naturally.