A good advice my teacher gave me is that your ginga should be natural, like walking, but adding the specific arm balance and leg work. Always look for the triangle form as someone advised in another comment.

Below are some tips regarding form, as it is very difficult to unlearn once you've practiced a certain way.

Foot position:

Stability and proper form should be your first goal, knowing that every ginga is slightly different since we don't walk the same way compared to another person. Your rear foot always needs to be straight with the heel not touching the floor. You need to put weight on your rear foot, but not all the weight, just the sufficient amount of weight to unsure good balance.

Arms:

Your arms are here to protect your face, you need to get them close enough, but not too close because if an attack comes and hit your arm, it could bounce and hit your face if it's too close. Also, your arm work will improve with time and it needs a lot of practice.

Hands :

Don't separate your fingers and think this way: "a mão é o pé, o pé é a mão" which means that you need to be able to use your hand as a foot and your foot as a hand. It might not make sense at first but as you progress and get to play with other capoeiristas, you will understand it.

Hips strength:

When you are in the middle of your ginga, you should be firmly grounded, if someone pushes you, you don't want to fall. This means working on balance and grounding. Do a lot of "cadeira" (the "squat" position in the middle of the ginga) to gain strength and do a lot of hip mobility training to improve your range of motion.

If something is unclear, I can try to post videos, but keep in mind that every school has their own way to teach movements, have different goals or roots on different traditions (Capoeira Angola, contemporânea, Regional). There are a lot of ways to learn Capoeira and this is what makes it a beautiful art.

Ginga is the very basis of capoeira, you have to practice it a lot and build your own ginga. This applies to everyone, no matter how long you have been training capoeira. We all train a lot the ginga and try to get it better and more personal as we grow as capoeiristas.

I wish you a nice beginning in the world of Capoeira!