Ticks and parasites

I have two whethers and am new to goats. I recently found a tick on one of my boys and realized I still don't understand much about ticks and parasites in goats. It honestly freaks me out more than anything else in terms of my goats' health.

What can I do to prevent ticks/parasites and how can I tell if a goat needs treatment?

I live in a region where it is quite damp and rainy from Oct to May. Ticks seem most active during our rainy season and not uncommon on our property (surrounded by wheat fields/cattle farms and a nice chunk of forested land behind us). We let our goats browse just about anywhere on the property, so they do sometimes get into taller patches of grass or low brush patches. Currently, they've been eating the fresh grass: measuring 4-6 inches in some patches, but I'd say closer to 3 inches in most places. There is little grass in their enclosure and they don't seem too interested in it anyway. I use DE in their house. I have also reviewed the FAMCHA info on this sub.

Thanks!