1) when my hob was young he used to bite. this might sound silly to start with but, pick her up and put your finger in front of her nose, when she goes to bite just push your finger horizontly into her mouth (not breaking its jaw tho!). and she should spit it out after a few seconds. just keep doing that and it will stop.
2) eerrm, when the jill gets older it MIGHT get less playfull. im not really sure about this because this is a problem i might have soon because im getting a young jill and im just going to see what happens.