PLEASE HELP ME!!

In my past i have stay in Lo Wu Correctional already for working illegal,,i got sentence for 3month but i just have totally stay for 35day only,after that immigration send me back to my country,ticket airplanes i buy by my self,when i leave Hong Kong ,immigration not give me cop or some mark in my passport,
My question is,,may i not nter to Hong Kong again in my future?arround need how long time i can enter to Hong Kong ?or someone can told me some lawyer or something for help me enter to Hong Kong again?
Thanks a lot of