Best thing to do is list what you have and what you need. Then you will get more worthwhile advice. It also depends on what you want to do as well, how long you want to go out for, staying overnight or not, want to use technical gear or old school methods, etc, etc.
There was a thread showing real cheap kit to get started on, can't remeber the title though. Dig around in the archives, use the search function and if you really can't find anything then people will help you out.
For a starter kit, a cheap pack (Surplus and adventure LK35 for a fiver) a few cola bottles for your water, a builders tarp, a mora knife for less than a tenner or a Opinel 9 (just got two today, they're massive!) to whittle stuff and cut your food for dinner, get a massive old bean tin from a cafe or similar as a cooking pot or use a tin from Wilkinsons for tea/coffee/sugar and make a decent cheap billy, make a penny stove to burn methylated spirits, get a few old blankets or a surplus sleeping bag, some waterproof clothing (A poncho is good as it doubles as a tarp) and spend good money on a good first aid kit and training to use it.
There are other things you can get, the above is a simple kit list that you can expand on, but there isn't a need to get expensive kit straight off. If you really like the hobby, you'll replace kit as you go along and grow out of it. To be honest, I'd be more impressed with a guy spending a few nights in the woods with a bean tin billy can and a few blankets than a guy with a grands worth of technical titanium gear!