Hi, I have adsl router (aolynk dr814) and I want to make it wireless. So how can I do it? Do I have to buy wireless router and connect it to adsl? Or can I buy WAP? Will WAP do the job? Or is there any other option?:) Thanks.

Buy a Wireless Router, Most have 4 ports for harwired connections as well.
If moneys is not a problem, you may want a Dual Band Gigabit N Router, about $150.
Basic Routers I believe are still less than $50

Do you have an ADSL router or an ADSL modem? They are different things. A Broadband modem converts the signals to be read over your LAN. A router just routes the signals. If you have a router then all you may need is a wireless access point rather than a router.

I have a Aolynk dr814 adsl2+ broadband router... So wireless access point will do? Also do I need to have static IP address? I'm not so familiar with this stuff, but I would like to know how it works. Do you know some good tutorials?

No the router part of your Aolynk will provide management of IP addressing within your LAN.