Best way to get back into it is self discipline. Its all about discipline and how much you want it. You have to make yourself get your ass to the gym everyday. It's tough, but it can be done. Make a commitment and follow through. If you aren't that committed, you might as well not even start. So many people think they can half ass it.....it never works if you do that. Consistency is the key.
If I were you, I'd start lifting high weight low reps coupled with a strict diet and a protein supplement. Take a "before" picture of yourself. You'll start seeing results in less than a month. Once the results start to show, then you're golden. Take an "after" picture and compare. You'll find it easier and easier to get to the gym because you know that you're making progress.
The first month is always the hardest, but some discipline will get you there. If you want, I'll post before and after pictures of myself when I let myself slip while I was still in college. I buckled down and got consistent and I look pretty good once again. I had to give up fast food and drinking so much, but it was worth it. Not only will you look great, but your blood pressure will drop off the face of the earth and you'll feel great.
Once you are the size you want, start with the cardio. 35 minutes every other day coupled with a lo/no fat diet. Dont' eat carbs after 7pm. The bike is good, but there is no substitute for good old fashioned running. You'll lose bodyfat quickly if you stay disciplined.
If you need any info just PM me..I can give you great routines and some places to get the hookup on protein supplements. Good Luck.