In reply to TimGough:
If you plan to get into outdoor bouldering then;
1. Climb as many easy problems as you can - you'll get used to reading the routes, improve your footwork, learn about mat placement, become more comfortable with topping out, learn about reading into weather forecasts etc.
2. Climb with mates where possible - they can spot you, you can spot them, you'll have more mates and you can work problems together.
3. If your mates don't want to climb outdoors and you do, go anyway. Just stick to shorter climbs with safe landings.
4. Log your climbs on UKC. It's a great motivational tool to tick stuff off. You'll have a record of your improvements.
5. If you only climb indoors then switch late on to outdoors, don't expect to climb anywhere near the same level. But that's ok.
Just one expansion on what people have said above regarding climbing indoors - on easier climbs, trying climbing very slowly but precisely, in a controlled manner. When you go for a hold, try and get it spot on so you don't need to re-adjust your grip. This will train your technique, will lead to greater efficiency and you'll get tired a little less quickly.
Post edited at 13:01