ok I've been trying for weeks to get a decent tune out but when I'm switching notes etc I find it difficult. Is there any techniques etc I could use etc?
Yes, have you heard of scales? Look up some lessons on youtube. Try the A minor pentatonic and Chromatic scales. They are good for getting the fingers moving quickly.
Oh! and practice. Maybe you could set a little practice routine.
I dont get what you mean, are u having trouble reaching the right notes? or like you need help getting your speed up to hit notes at the right time?
I agree with what Fight The Foo! said. Also if you're going to practise those scales properly you will need a metronome of some sort so that you'll be playing in time. Try looking in the lesson section here on UG as well as YouTube as there are some useful lessons.