Hi, it sounds like you are nearly there.
I suspect the elevator & pitch servos need to be swapped (often easiest to just unplug those 2 from the receiver and swap them there)
check "swash type" is set to 120*for a 450 clone, ( or 90* if you have an Interceptor 400)
to check all servos are connected to the correct channel :
right stick move left/right, both rear servos should move, front shouldn't
- if they both move in same direction, use reverse menu to change 1 servo
- if they both need reversing change from +60 to -60 in swash mix menu
This should get you started
Change 1 setting at a time and recheck.
There are a few setup guides, search should find them or someone else may be able to put the links here for you.
Hope it helps, if still not right let us know what happens with the tests above.