Hi Sarah, and welcome to the forums

I haven't got long on here so I have to be vague and so apologise in advance for that.
Safe? You won't have any problems as long as you have an single ounce of common sense (thousands don't).
Looking for work? You won't have any problems as long as you're reliable, honest and punctual.
The fact that you've stated what you generally 'intend' to be doing I reckon you'll have no problems there also. Is a thousand pounds enough? It depends. For how long do you want it to last you?
Hmmm, how to save money: mix with the locals, be good to them, show willing and you'll probably get cheap (free) accommodation and food. Easy. My biggest advice? Be a willing sport and take a constant positive calculated step towards the Aussies, Kiwis and Thais and you WILL be amazed. You could 'almost' live and enjoy life as long as you want, for free. Almost, yet the vast majority of people don't see this and therefore don't use this to their advantage. No problems there, bye bye, enjoy the ride home. As for you? Well it's up to you. Enjoy!