China Visa Clarification

Hello,
My husband got a job offer in China.His company is not registered in china currently.As per my knowledge it will be reigistered within 2 months..His visa is M type...Can myself and my kids come gotogether with my husband on tourist L and later change to S1 type??Could you please tell me any other issues to be ruled out before coming there???As it is very urgent,kindly help me...
Thanks