Yes, just about all wireless routers come with at least 4 standard Ethernet interfaces, Cat5 or Cat6 compatible.
Yes you can
Wireless B is the 802.11b standard.Any Wireless B routerr has a bandwidth of 11Mbps
The question seems to be about getting two routers to communicate.As we know routers are used to connect separate layer 3 networks. However routers have their own communications protocols such as RIP (routing information protocol) for class-full IP, RIP2 for CIDR (classless inter domain routing protocol). Class-full is the original IP address class definition. Class A, B and C had specific network mask such as 255.0.0.0 for class A, 255.255.0.0 for class B and 255.255.255.0 for class C.CIDR allows the network mask to be expanded to any length desired to reduce wasted addresses when several sub networks were needed. The term most often used when expanding the network mask is borrowing host bits.Back to the router questionBoth routers must be running matching routing protocols. RIPv4 or OSPF (open shortest path first) for exampleBoth routers must have an interface on a common network or subnet between them to pass routing information. This same interface will be used to pass all IP traffic once configured.In the CISCO environment each network the router will route for needs to be added to the router configuration.Once these basics are achieved routing tables will be built by dynamic updates from other routers.Output from RIP protocol router belowRouting Protocol is "rip"Sending updates every 30 seconds, next due in 26 secondsInvalid after 180 seconds, hold down 180, flushed after 24010.0.0.0/24 is subnetted, 3 subnets the router has been told to add this networkC 10.1.16.0 is directly connected, FastEthernet0/0 this entry was added when the interface was enabledR 10.1.17.0 [120/1] via 172.16.1.2, 00:00:20, Serial1/0 this entry is the result of a dynamic update from an adjacent routerR 10.1.18.0 [120/2] via 172.16.1.2, 00:00:20, Serial1/0 this entry is the result of a dynamic update from an adjacent router