Sorry, but I am struggleing to understand exactly what you have done, or are trying to do. However, the following are assumptions, based on what you have posted, and on the technology in general.
The APs are usually layer 2 devices. The static IP for the AP is usually for management only.
Every AP will transmit and receive, this function is not separated over different APs.
If you want users on the old APs to use the router, then they need to connect at layer 2 to the interface of the router, that needs to be the default gateway for the user PCs.
I presume the APs are to provide Internet access for the guests ?
The RADIUS server was probably there to authenticate user access to the wireless network.
This often uses different VLANs, which are mapped to different SSIDs in the wireless environment, one for the guest to access initially, then they pay, and authenticate to the Internet access VLAN.
Other things you need to consider are if this is chargable, then the usual procedure is that a guest first connects to the wireless network, on the ‘GUEST’ VLAN, which directs them to a portal where they can pay for the service. Then they authenticate, using RADIUS, and are placed onto the access VLAN. This has layer 2 connectivity to the router, and then out to the Internet. To do this you may need to use 802.1x as the method of controlling the access to the VLANs.
My first step would be to look at the existing configuration of the access points, and work out from that how the access is controlled (if indeed it is controlled at all).
How you set them up depends on the make and model of these, and also how you want to control the access to the Internet. As always, some more information is needed to provide a more specific answer.