Sorry dude, i prefer stay anomalously. My clinic is at norther part of M'sia   
Use soft toothbrush!! Hard toothbrush is use to wash the toilet bowl,haha!! I know how enjoying or 'feel' more clean after brushing with hard toothbrush, but trust me, is the technique that matters, not how hard is the toothbrush.

Electronic and manual is very subjective, i tried both and i still prefer the manual. I dont think there is any side effect of electronic tooth brush other than its more expensive 

Should I use mouthwash?
Yes, using a mouthwash that contains fluoride can help prevent tooth decay and help get rid of any last bits of bacteria or leftover food that you might have missed with your toothbrush.

However, don't use mouthwash straight after brushing your teeth. Choose a separate time, such as after lunch. And don't eat or drink for 30 minutes after using a fluoride mouthwash.

Many mouthwashes contain alcohol, so they're not suitable for children, as they could swallow them accidentally. If you use a mouthwash with alcohol, you may get a very dry mouth and dry, cracked lips due to the drying effect of the alcohol. You can avoid this by using an alcohol-free version.