Tell them everything they ask for to the best of your ability. Use approximate dates as needed, just mention that they are approximate in the remarks.

If they find something that you did not disclose, they will assume that you lied to cover something up and you will not be hired. Entry-level pilots tend to move a lot and work a lot of odd jobs so recruiters are probably used to complex histories.

If you mowed lawns as a teenager and never had a W-2 you probably don't have to mention stuff like that.