The answer to the question whether you should lose weight or build muscle first will depend on your specific issue on fat and how much of it you have. The bottom line is that if you are obese then you should definitely lose weight before you start to build muscle.
Should you lose fat or build muscle first?
The definition of obesity is over 25% to 30% body-fat and this is the only exception when it comes to deciding to lose weight or build muscle first. The reason why it's the exception is that the general rule is to build muscle first then lose weight to show off all of your hard work.
Even if you are not obese, losing weight doesn't necessarily mean your ab muscles will show if you don't have strong ab muscle definition. When you get stronger by having an established weight training routine you will put on muscle all over your body. You can achieve stronger more defined muscles by doing compound exercises like squats and deadlifts.
Building big muscles under your fat
This means that your abdominal cavity will get thicker as you get stronger and it will start to show itself whether you are overweight or not. The same can be said for the muscles in your upper and lower body as these muscles will show the increase in strength that you are getting by becoming larger.
It will obviously not happen overnight and you need to change your habits and start avoiding the eating patterns that got you overweight in the first place. This might take a bit of research online but the information is freely available on how to eat correctly and what to eat and when to eat.
Eating habits and regular training for a more balanced you
But your objective is to start training first and start putting on quality muscle by getting stronger and changing your daily habits. Only when you have started to see that you are into a regular routine should you start to think about losing that fat which is hiding your muscle that you have worked so hard for.
When deciding to start training you need to start with the basics and that means compound exercises which are designed to get you strong. The most important aspect of doing these compound exercises is doing them the correct way with the correct form and technique.
So where do I start?
In conclusion if you are not obese which means a body-fat of over 25% then you should first start training to build muscle before you start trying to lose that excess weight/fat. There are very specific guidelines that will guide you to the exact way to go about it and how to count calories.
Once you have started getting into the daily routine of training on a regular basis of at least three times a week you can start looking at the many weight-loss options out there. Counting calories has proven itself to be very effective but that does not mean that there is not another way to lose weight effectively.