Hi and welcome
@Vaping on the dole . You're doing good so far. As others have said 50/50 is a safe ratio for all the coils in your range. With 70pg you might experience some leaking/ gurgling or flooding.
To prime the coil just put a couple of drops down the centre of the coil before putting it in the device. Then put the coil in the tank and fill and leave for about 10 mins. Start vaping at a lower wattage than you would normally for that coil to bed it in. Maybe half a dozen puffs. You can then build the watts up to your sweet spot.
Have a look at onepoundliquid and 88vape for some cheap liquid.