In reply to bpmclimb:
As mentioned above, get some insurance and kit and away you go.
I freelance in the outdoors and like many others have a small business too. But I'd say that's quite normal. If you're already qualified, then freelancing works really well, tons of freelancer pages on Facebook.
But it also works to get your reputation around. Having your own insurance a company name and bits of kit can lead to work coming your way as it's a small & friendly industry I've found.
I'd happily pass on clients to other mates etc
Might I also add, that if you do set up a small business, find out what the standard day rate and pay yourself more or equal.
The competition in outdoor work isn't the cost, it's the calibre of Instructor.
If you go down the route of make it cheaper, that'd be really sad and offensive to all other established businesses.
I am never going to be rich working in the outdoors, but I love it...just not for 80 quid a day as you see advertised.
Best of luck.
Dan