Simple question 750GL dual wan

Wanted to ask a silly question. I have RB750GL. i want to use first two ports as wan for load balancing and the other three ports for lan. i.e three pcs would be connected via RB750GL directly. is it possible ? or i need to connect another simple cheep router to connect all pcs via lan ?

Yes it is possible.

Thank you and what about dhcp server ?

Dhcp server is possible also.