Looking at my chest to start with.
Ive been doing 3 sets of 25kg at 10 reps.

So taking my bench to 5 x 5, will this mean something like 5 sets of 30kg ?
So keeping the weight the same for the five reps ?

What should i do for squat and deadlift ?

As i fully understand bench, squat and deadlift are the main compound movements.