EASIEST branches
-Reptile vines/sticks
Most come with suction cups and most big pet stores carry them in reptile sections. If you have a screen cage, use fishing line to tie them to the screen (no, it does not hurt the screen).
other branches
-Collect from outside (then wash with salty water/set oven to 350-500 f and then turn off oven, stick the sticks in for around 10 minutes)
-Buy manzanita branches (found at home goods stores, craft stores, ebay, etc)
-Buy grapewood branches (thicker than manzanita)
Most sticks you will need to drill holes into to get them to stick sideways in the cage then tie to screen with fishing line.
EASIEST plants
-Pothos (does very well with the humidity in the cage and watering, as well as UVB already in cage. provides lots of vines. safe for chams to eat if they want)
-Ficus benjamina (provides lots of leaf cover, vertical branches, safe for chams to eat. easy to take care of but will drop most leaves when they are moved to a new environment, don't worry the leaves grow back easily with the water and uvb)
-Schefflera/Umbrella plant (looots of plant cover and the branches are pretty sturdy, edible for cham, etc)
-Baby tears (good to plant in fake walls- see this thread
https://www.chameleonforums.com/reasons-why-real-chams-need-real-plants-115143/)
other plants
Safe list:
http://www.flchams.com/safe_plant_list.asp