Treat this with humility and seriousness – it’s a great privilege & responsibility!
Go over the talk making yourself as familiar to it as you can. The more you commit to memory the more comfortable you will feel delivering it.
Write notes on an appropriate piece of paper (if you want to keep it in your Bible A5 might be best). You might want to ask for a stand if possible – that will free your hands and allow you to move. You might want to put a Power Point presentation together – just your points; people might remember them better
Try to look at people while you talk. Vary the tone/volume of your voice and avoid becoming a statue. Try to avoid mannerisms (i.e. hands in pockets, grabbing the stand, scratching etc) – they tend to distract people…
Don’t start in-jokes with the crowd – it can distract the audience and leave you confused. Be careful with humour – better ask someone wiser if it would be appropriate to use…
However challenging you need to be – Be always full of compassion!
Make sure that the people do not necessarily remember you or your talk/talent but Jesus – mention Him as much as you can!