BR44,
It sure sounds like a heater hose or heater core. Both can leak in the places you mentioned. Others have been right on telling you the problem area.
If you are new to these trucks and to working on your own stuff. You would be well ahead to start reading the manuals. The -20 tells you how to take it apart and the -20P shows you drawing of the parts you need to take apart.
If you have a spider problem, take a long transmission funnel, stick the hose of a vacuum in the big end and sweep the small end around the spider area. It will suck them all up without your hands getting within a foot of the area.
I would suggest you get a flash light, a rag and something soft. Put the something soft on your radiator/front valence top. Climb up there, put your knees on the soft thing and one of your hands on the cowling between the windshield and the firewall. Use the flash light to follow the two black hoses that run from the front of the engine back to the firewall under the fuel filter. Wipe off the silver clamps at the hose ends, the hose ends themselves and the copper pipes sticking through the firewall that the hoses are around. Figure out if one of them is the source of the coolant leak. If one is, use a straight edge screwdriver to tighten the clamp some.
Wipe the area down again and wait for a drip. You could also have a broken or cracked hose, cracked heat core inlet/outlet or just a bad clamp. You and us won't know until you get in there and look around.
