14 nearly 15 and wanna build muscle?

okay im quite strong i just wanna get more muscle and body shape i was thinking on getin maximuscle cyclone? would i be allowed or am i to young? and this aswell http://www.argos.co.uk/static/Product/partNumber/3355549/c_1/1|category_root|Sports+and+leisure|14419152/c_2/2|14419152|Home+gym+equipment|14419293/c_3/3|cat_14419293|Weight+lifting+and+exercise+benches|14419306.htm