where do you live,there is bound to be a paintball site near you,have a few more rec games and ask people if you can try there markers out,most paintballers will be happy to let you,this way you will have a better idea of what you want.your mum will also see your serious about playing properly,also see if she will go down with you,this will show it is a safe sport when played properly.
buying cheap markers is not a good idea,save up your money ang get somthing decent,second hand is a good way to start.
the most immportent piece of equipment is a decent mask,i would get that first(saves you having to play in a old sweaty site mask)