Salam dear expert plzz tell me about wirelss internet cable?

Mea Already lane per net cable chala raha hoo with ISA Server.kia koi mujhe bata sakta hea k kitna kharcha aai ga mujhe wireless network chalane k liye. I thinkg Tplink ka Ap 1700 and 4000 ka bhi hea aur ab mujhe yeh samjh nahi aarahi hea k me konsa Ap use karoo aur aur us k sath konsa Antena lagaoo 12db or 14db ya koi aur.aur aage agar mujhe Ap lagana parta hea to konsa Ap use karoo mazeed extend karne k liye. aur woh Ap repeater bane ga ya phir client. plzz tell me mujhe samjh nahi aarahi hea. Agar koi bahi wireless chala raha hoo to mujhe batai aur costly bhi na ho.

Thanks.