Hi Seal and welcome aboard. You don't need to spend a tonne of money to lose weight - though I've noticed the cost of getting fitter is certainly increasing!
Walking is a great start and all you need are a pair of trackies and a pair of runners.
Check out the Calorie King
website to work out how many calories you're consuming and maybe even an eating plan. It's free to join up now (if you're in Australia).
I found that by reducing my portion size and upping the exercise a bit has given me really good results.
All the best for your weightloss journey
Just keep moving! And don't be lazy...
SW: 74.3kg - 1/1/09
CW: 71.1kg - 3/5/09