First syringe out as much of the old fluid from the reservoir as possible. Fill the reservoir to the top with fresh fluid so it will only be old fluid from the pump down the lines.
As for the meths, I have not YET found the need to use them so can not vouch where and when along with how to ensure the meths is completely out the systems.
Yes from the furthest wheel BUT from the ABS system so rear right rear left front right front left and finally the clutch.
Good idea not to touch the brake pedal as it is easy to over run the normal travel and cause master cylinder issues.
By using the syringe you are sucking the fluid through so less chance of problems. Any air bubbles you see unless the reservoir is empty will be leaking past the nipple threads, but there will NOT be air in the system.
As for the clutch it is very easy. Be careful as the slave is all plastic so do not get aggressive with the bleed nipple and only retorque it to specification. Just fit your clear tube onto the nipple and slacken it. It may take more slackening than you expect just make sure it does not fall out. With the end of the clear tube in a container , something like a small yogourt pot press down the clutch pedal to push out fluid. Do not be alarmed if the pedal does not return, just put your foot under it and lift it back up. After about 4-6 pumps the fluid will be clear. Carefully tighten the nipple, remove the tube and dispose of all the used fluid responsibly. The clutch pedal should now operate correctly and return as you lift your foot off it.