My advice, if you want goats as clearance machines..... which they are very good at... then castrated males are your best option.
Otherwise with females, you will be stuck with screaming goats 'in season' during the autumn who will do their best to find a mate.
Most people who use goats for clearance work, don't want to be bothered with twice daily milking which is why castrates are the best choice.
As for tags, if you buy in goats, they will already be tagged,.... you will only have to replace the original ones when they get torn out, which they will with regular frequency.
As for breeds, don't go for ones with long shaggy coats.... they will get caught up in the brambles & need to be cut out. Short coated British Toggenburgs, Alpines or Nubians are your best bet. White goats will suffer from sunburn in the summer.