if all you know about driving a sidecar is what you have read, and you are driving a home built rig your miles per day estimate is a bit optimistic. Links will reduce steering effort and fatigue but will require more attention to what you are doing, not less, because the steering will not only be easier but quicker as well. Stock forks will work fine, a fork brace and/or wider front tire will help control flex, but you may find they are quite fatiguing, particularly if you insist on high mileage days.
the Red Menace
"You are measured by how you ride by people who ride, and how you pose by people who pose." Alejo
"Riders who get pissed off are doing it wrong." DAKEZ