Hey, i own 3 giant centipedes.
A scolopendra subspinipes de haani
A blue tiger legged centi
and a baby scolopendra sp.
And as what has already been said, they are not a beginner invert! highly aggressive, our biggest girl is 22cm and has to be kept in a 32cm deep tank, as they can jump and also can chew through petpal tank lids and mesh, also if they can reach the top of a tank, the moment you take the lid off they will be gone!
If a large centipede such as my big girl bites you it will without a doubt put you in hospital, not nice! even a young one might put you in casualty
So my opinion, unless you are totally certain that you are ready to own such a creature, then start off with a tarantula or scorpion
Please don't buy one just because they look 'cool'