At this stage (1 month in) you don't really need anything, your training hasn't stabilised at all yet. Post in the diet forum and you will get some good help there which will help you noticeably more than any supplements at this stage.
Once you know how much protein you need per day (depending on your goals and lean bodyweight) then see how much you get from diet (google 'calorie count' for a good website) then if it isn't enough, add more food until it becaomes too expensive/inconvenient and at THIS stage you may want to get some protein - whey protein is a good shout, or a good blend of whey/casein/egg.
Apart from that the only things you MAY need are a good multivitamin (not just the cheapest one around) and possibly an omega 3 supplement if your diet is deficient. After a few months then you may want to look into things like creatine, hope this helps!