You have a several choices here Alan, all depending on budget.
1. Buy a Sorby Pro-Edge, dogs wotsits for sharpeing all types of gouges, skews etc, price about 300 quid.
2 Buy the Tormek sharpening system, similar kind of cost.
3. There are a number of people producing jigs for sharpening on a (normally) 6 inch grinder, usually these run to about 30-40 quid, but won;t have the range the Pro-Edge will.
4. Free hand grind, best done with some tuition from someone who knows what they're doing. Although you can find a lot of good stuff on YouTube.
Options 3 & 4 need the bench grinder of course, again up to you how much you want to spend. You can get quite adequate machines for as little as 30 - 40 quid, machinemart do some (Clarke) and Aldi sometimes have one on special if you can wait.
Hope that helps a little.