Start by looking up internet forums on t-girls (they really don't like the term shemale). There's one called Hung Angels, though not as many girls post on it as before. Forums are susceptible to flaming wars that drive users away sometimes.
In Thailand, t-girls are referred to in English as ladyboys, translated from the Thai word, Kathoey. For Thailand there are two forums that I like: ladyboyspattaya.com and bangkokladyboys.net that have great info if you ever plan to visit. I haven't visited yet, but it is one of my goals. The three main locations/concentrations for Thai ladyboys are in Bangkok, Pattaya and Phuket.
Most major cities in the world are going to have higher concentrations of t-girls, because of higher population numbers but also because there is usually more acceptance and tolerance in the large cities. Two cities in Europe that might be closer to Malta are Milan, Italy and Barcelona, Spain. Amsterdam has legal prostitution, and a sizeable number of t-girls work in the red light district. These seem to be among the more culturally "hip" cities in Europe and seem to have larger t-girl communities, based on the number of listings on escort websites. Of course, you can also find girls in most of the other large European cities as well.
In the United States, the top cities seem to be Los Angeles, New York and San Francisco, but other large cities will also have higher numbers, too, such as Miami or Chicago. If you want to "meet" the more famous t-girl pornstars from the US (if they are escorting), start with Los Angeles. San Francisco has a very large gay/lesbian/transgendered population, the highest in the world I believe (as a percentage of total population). It is considered the gay friendliest city in the world (though many of us t-girl lovers don't identify as gay).
In South America, Brazil has the largest t-girl population, being the largest country there. Many t-girl porn actors come from there, and many Brazilian girls can be found escorting in other parts of the world, especially Europe, as they can make much more money escorting there. Argentina also has a szeable t-girl population, probably second to Brazil.
Some thorough searching on the internet will produce most of the info you need, I think, but you can also post questions on this forum. If you are interested in seeing an escort (paying for sex), that won't be difficult, but do try to learn about tricks and scams that are often pulled in some of the various locations, such as Thailand.
If you are interested in meeting a t-girl for a possible relationship, not as an escort, then there are t-girl dating sites on the internet, but like all internet dating, there are risks involved when you can't meet face-to-face easily. In that case, you are probably better off relocating to one of the cities listed above and getting involved in the t-girl social scene. I lived in the San Francisco area for 20 years, and even there it's not always easy. T-girls often feel they are considered marginal, even invalid as human beings, which is often true, so they tend to congregate in ways that are more difficult for others to meet them socially. The most attractive and passable ones often get into escorting or porn for the money, which also makes them targets for t-girl chasers, and men hit on them all the time in public. I had a t-girl roommate for 1.5 years before I left California, who is still one of my closest friends.