The best investment in you can make will be in the correct footwear
With the clothes thing theres loads to choose from if your going to internet shop
the companies i have dealt with and have had great service from are Northern runner in newcastle, wiggle ,co.uk sole obsession for shoes but there are loads of others but i can't recommend them as i have'nt used them
There appears to be a problem with a firm called ontherun so i'd steer clear of them
tkmaax seem quite popular with some members
On the shoe front get your gait analysis done at a specisalist running shop it's generally free and will save you problems in the future also try on various makes of shoe as they can vary in size width etc.
Ihope this is of some help to you good luck with your running
take it easy!
