How to Connect One 3G Router to Another establish ideal Network?

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I have two routers,One 3G router1 (local cheap brand),another one is the most advance router2(300 mbps,dual band).I don't have broadband connection at my place, so i decided to use a 3G router to access internet.Router2 doesn't have 3G capability,so i have to connect to router1 for internet access.
My router2 would be connnected with one of my desktop (need port forwarding to 3389,permanent ip address config), NAS system (again need a permanent ip config) and mobile phones.I am planning to configure the free Dynamic DNS service to access my desktop,NAS system remotely over internet using router2.The router1 can assign a limited number of DHCP over radio (max wifi connection to 10 users), therefore i am planning to disable the DHCP service of router1 and enable the DHCP service of router2. Also, i would like to use my router2 for HD video streaming. Basically, i want to use router2 for all services except internet access as i have no other option rather than 3G router1.
Note: I can connect my router1 to router2 using LAN cable. My 3G router have only one RJ25 port and router2 have 4LAN and 1WAN port.

One possible solution:-
Router1 config: DHCP is disabled,select diff channel from Router2(make sure no frequency interferenc),same SSID,no port forwarding or permanent ip setup possible as DHCP is disable
Roter2 config: DHCP is enabled,diff channel from Router1,same SSID as Router1(,config port forwarding,permanent ip config

Please suggest me the solution of my query.