What type of flash setting should I use and how lowest ISO should I use. Thank for guide me along.
1) What is the thing you try to shoot?
2) What type of lighting is there? Just saying that it is night time is not really enough, I mean, you would need to be more specific - like was it indoor or outdoor, was it brightly lit or very very dim.
3) ISO setting is the same as how you would like to set your ISO at whatever lighting condition. For flash, I normally set my ISO at 400 (but that is not the golden rule - if there is a golden rule).
4) I would like to bounce my flash, but this is not applicable if there is nothing for you to bounce.
As to what flash setting to use, there really is very difficult to tell you unless we actually know the exact environment, and even then, most of us would need to do some fine tuning here and there to get the shots we want. Plus there are differences as to - how my flash you have, was it on-shoe or off-shoe, was there reflector, softbox, or whatever.
Flash photography is a big thing, you might need to read up more (fortunately there are heaps of online helps and youtube video that show you pretty much every aspect of flash photography). Finally...
practice make perfect