Hi there,
What I do when starting my TZM is follow the bike manual which is to open the choke fully and kick start the bike. Once the bike is started, close the choke halfway and rev from 2 to 2.5k rpm. After a few seconds, close the choke fully and continue warming the bike up for 3 mins before moving off.
I tried starting the bike without the choke before and it is very difficult to do so. Hence, I never bother using this way again

A replacement sparkplug for the TZM should be around S$4 only. Even if the plug is fouled, it can still start as mine was rather oily before but there wasn't any problem starting the bike.
Hope this helps.