Thinking shes the boss

Well Star´s getting to that age now where she is starting to think thats she´s the boss, hmm don´t think so lol.
I was letting her sleep on my sofa and not in her cage in the day time but now i´m thinking that was the wrong thing to do with her at such a early age, as now she is starting to bit when i ask her to get off or she jumps up and starts biting me, i know some of this is just normal puppy stuff but she does push it a bit to far sometimes, not only that she is constantly wanting up on my lap which is fine when shes a baby but got to start thinking now of when shes bigger.
Today she really bit me very hard not the normal puppy play thing, i do know the difference. I can tell you it really hurt, she didn´t seem to bother, so i got thinking that she is now trying to find her place in my pack.
From today i have decided to now tell her that her bed is the one in her cage not on my lap or on the sofa unless i tell her different,i feel this is the best thing for her and me. Shes not liking the new rules and is doing everything she can to annoy me, which isn´t working. I am and will stick to the new rules as i don´t want a dog that thinks its the boss and not me, i feel that doesn´t make for a good relationship between me and my dog and will be better for her in the long run and will make a more balanced dog in the end. I can tell you its not easy, shes constantly jumping on my sofa, then when i put her on her bed she wrecks it, i know shes doing that so i give in and is trying to see if i do but she doesn´t know me that well yet, i don´t give in if i have set my mind on something lol.. Who will be the winner in the end? Me lol.
Some people might think im being mean, nasty but im not, i love my dogs and would never do anything to hurt them in any way, i´m firm but kind. I am doing what is right for her and to let her know that yes i am the boss in this house.
I will let you know how i get on with it, im sure it will be fine in the end, shes just getting to that age.