It is very common for guys to start and stop training frequently. The biggest issue is they want everything perfect to optimize gains in the shortest possible time. Burn-out quickly follows. This may or may not be you, but a little discussion on it may help somebody else, so here goes. . .
You want to start out with the simple things. The more simple it is to master, the more likely you will be to stick with it. And consistency and progression are the keys to success.
For lifting, forget the super-duper split routines that are garenteed to hit every muscle that you want to see get bigger. Work on a few compound lifts that will get everything important growing and getting stronger. The more simple it is, the more likely you are to see progress and stick with it. For instance:
Too simple? Nonsense, it will get you growing and getting stronger ALL OVER. Pick a weight that allows you to complete 12 reps EASILY, then add 10 lbs a week to the squat and deadlift, and 5 lbs a week to the other lifts. When you can no longer get 6 reps, keep the weight the same until you build back up to 12 reps, then add some more weight.
Conditioning is also important, but keep this easy too until you create a routine for yourself. The easier it is, the more likely you will be to stick with it. Try walking for 30 minutes on Tuesdays and Fridays. Once that gets easy and habitual, try running sprints. After that maybe progress to some hill sprints. Keep it short and simple.
Same thing goes for your diet, keep it simple. Start by eating 3 or 4 times a day, that's pretty typical. Try eating a good balanced diet and cut out all the extra junk like sodas, chips, and ice cream. Eat lots of fruits, vegetables, and lean meats. Make eating healthy a habit.
Doing these simple things for a whole year will give dramatic results. There is absolutely no reason to get complicated with this stuff. Make progress on a few simple things and you are most likely to stick with it.