Turkish words do NOT start with two consonants. The following examples are loanwords as they start with two consonants.

Tren 

Klima 

Kredi 

Kral

 star (as in tv)

spor

Between the first two consonants, most of the time there is a hidden "ı" or sometimes "i" sound. If you are not sure, use "ı", that will fit %90.

Tiren (Tren)

Kılima (Klima)

Kıredi (Kredi)

Kıral (Kral)

In Turkish words , certain  consonant couples can be seen ;

-lç, -lk, -lp, -lt ---> -, ilk, alp, alt

-nç, -nk, nt   ---->  inanç, denk, ant

-rç, -rk, -rp, -rs, -rt ----> sürç-, ürk-, sarp, pars, art

-st ----> üst