I am new to this site and need help with 2 problems. Any ideas are very much appreciated. I have looked up online with no success and am hoping someone can help me here. :?

First, my Ficus Elastica was totally thriving. I want to say I've had it for a month now. I bought it due to it being the best looking Ficus of the bunch and it being a good indoor plant. I brought it home and put it in a bigger pot. Things seemed to be going well. I have been watering it as directed on a website I looked up. But for some reason the leaves are falling off, from the bottom up.*:( This worries me, bcuz the leaves look fine, except for the very tip of some of the leaves are brown. So I am wondering if I am NOT watering enough. Or if it is possible that I need to buy some indoor plant food. I am not sure. Someone Plz Help...

Second, I have 3 pots, indoors, with thriving Caladiums. The problem is the stupid bugs.*:X I am not sure how often or how much to spray them with the 3 in 1 Insectiside. The directions are NOT very good on the bottle. Just says to use a 7 to 14 day schedule. I sprayed the plants about 3 days ago and the bugs are still around. They seem to be a nat type of bug. They are also starting to go to my Ficus and other plants as well. Anybody have any idea what I need to do to get rid of these PESTS???...

Thnx for any help, in advance.
Alie