Clang! Sorry Callum you dropped soemething there
Regarding signals, display the ones shown in the LotG. It's not down to personal preference. When you are regularly featuring on MotD or the FLS then you can start displaying "style". Until then use the prescribed signals.
As for the whistle at a goal, if you think about it, the most common reason for blowing the whistle is if there is an infringement. Play stops, players look at you, you have to make a decision, you become the centre of attention for no valid reason. Unless it's a close goal/no goal decision, then just move away and re-position for the kick off while monitoring the interaction between the two teams.