as wr wb
brother
yes it is correct brother.....our Prophet Muhammad(SAW) said that we should make our first raka'a long and second raka'a short and it does'nt matter from where or which surah u recite in ur salah but the words should be clear and it should be recited very slowly and clearly
i have learned this from my uncle ,he is a scholar(Alhamdulillah) but i dont remember the no.of the hadith or in which book it is.........i will ask my uncle very soon and then tell u INSHALLAH
wa'alaikummussalam wr wb
ur sis
Jowayria