How I play the Windsong Lyre - BACKSTREET BOYS - INCOMPLETE

Intro:

S G J G S N     N F H S F S N 
A F H A F A F D [sM] [aN] [sB]
S G J G S N   N F H S F B  
[gZ] Q F Q D A b

Verse:

[mJ] G x [nH] F v [nH] F F D G b

[mJ] G x [nH] F v [nH] F G A [cmF] D S 

JWJ c [nH] Q H v

[aQ][nH][nH]GJHG

[mJ] [bG] x [nH] [vF] V [bG] G F D S  [xS]

Chorus:

W R  [fR][zfR][dE][dE][sW][dE][fR][dE][dE][sW] J
WW R x [fR][fR][zfR][dE][dE][sW][dE]
s x  R T [vF][sW][fR][zgT][fR][gT][hY][gT][fR]
W R T R T Y T R W T Q
[fR] [dE] [nH][sW] [fR][dE]

Instructions:

The capitals are for the melody.
The small letters are optional if you want to add some 'harmony' to it.
Keys in the brackets [] are to be played together.

Disclaimer:
I am still trying to figure out a way to present the note in an easy way to understand, because I write them down on paper for myself adding some additional signs that I guess only I could understand, so forgive me if you don't understand the 'notes' ;/