For mosquito and flies nothing works better than toxic permethrin. Once you know how to handle it it stores as powder nearly forever, one treatment of outter clothing is is good for a season.
As added thermacel, look on you tube how to make refillable. On farm it works wonders during fly season, so does bat boxes and swallow nesting poles.
Learning how to make arnica into paste and oils is a must for the for sure soreness that comes from a lifestyle shift to much more physical output.