ADVICE NEEDED PLEASE

thanks andy for moveing me into the right part off truck net , its a big step to work for your self but i know a lot off the members will give me help and advice
which i shall be loohing forward to read over the weekend but i will keep you all informed how it all goes.
here is another question if some one could answer for me my brother will be the main driver he only has car licence at the moment hes 20. for him to get a 7 and half ton licence does he have to be over 21,with me i can just do my class 2 at the end off the year so iam ok age wise.if any one has any other suggestions about this venture please let me know as iam open to all suggestions
many thanks wayne