Here's some free advice
Have it all PAT tested with a machine once. This will cover you for up to 5 years.......BUT
Visually inspect your gear regularly If a plug is broken, replace it PROPERLY. Don't leave a load of bare wires outside the terminals. If you don't know how to wire a plug, don't be daft and have ago without checking, just look it up or get someone who does know FFS.
If you see insulation showing or if there is any damage on a cable, shorten the cable pass the point where it's damaged OR replace it.
Fuse ratings are:
Anything under 700 watts is a 3 or a 5 amp, anything over is 13. All extensions must have a 13amp fuse.
97% of all failures during PAT testing are found on a visual inspection. It's a lot to do with common sense, if you're going to use something regularly in an environment where it may get damaged, yanked, have stuff spilled on it. check it for any damage before the gig. If something isn't how it should be-get it fixed or replace it.
Some of you may or may not know this but...you don't even need to be an electrician to carry out PATs........just competent.