all of the permenant world items can be placed within 3d world studio, however they will be part of the map or object, so just make permenant features in the map, then place items using code.
here are two methodes you can use to move a character
moving an object using pressed keys
//set up sync
sync on: sync rate 60
//make player (in this case a sphere)
make object sphere 1,10
//main loop
do
if upkey() = 1 then move object 1,1
if downkey() = 1 then move object 1,-1
if leftkey() = 1 then move object left 1,1
if rightkey() = 1 then move object right 1,1
loop
or by moving the camera for first person view
//set up sync
sync on: sync rate 60
//make player (in this case a sphere)
make object sphere 1,10
//main loop
do
control camera using arrowkeys 0,1,1
sync
loop
you will find a lot of really useful information in the dark basic help files, there are many example programs to pick apart and play with.
every command is well documented with explanations and examples.
hope this helps
Sometimes I like to use words out of contents