Hi Rickman
Slimming World do do an online version of their membership which would avoid the need for you to go to classes. Have a look at their website Slimming World which should answer some of your questions.
The basic idea is to make each day either a 'red' day or a 'green' day, and on each day you can eat umlimited amounts of certain foods. eg on a green day you can have as much pasta, rice, potato, couscous, bulgar wheat, pulses, veggies, fresh fruit, quorn etc as you like, but only limited amounts of fish and meat, and on a red day you can have unlimited amounts of lean fish and meat, plus most veggies (not potatoes, parnsnip, beans, sweetcorn or peas), fresh fruit etc etc.
You also get measured quantities of milk and/or cheese each day as 'healthy extras'.
That's a very potted explanation, but hopefully gives you some idea.
We also have a SW thread on here, so if you follow it and get stuck you on something you can always come and ask us.