SRX340 as Internet Gateway

Hi!

I am working for the first time with a Juniper equipment.I am trying to set up my machine (SRX340) as the internal network internet gateway.I do not have any VLANs, I just wish all computers in the internet network could access the internet through this Gateway.
I tried setting up using the Wizard and also searched for materials on the internet, but I did not succeed with any settings. At momento computer can not access the internet, but If I try to access the internet through the equipment  via CLI it works (ping works normally).

Could you help me with this setup?

This is my interface configuration:

ge-0/0/0 - ISP Provider

ge-0/0/2 - Gateway for internal network computers

fxp0 - Management interface

static route - Gateway from ISP

Securty conifguration - Internal to Internet - ALL,ALL

interfaces {
    ge-0/0/0 {
        unit 0 {
            family inet {
                address 177.19.201.116/29;
            }
        }
    }
    ge-0/0/2 {
        unit 0 {
            family inet {
                address 192.168.5.200/23;
            }
        }
    }
    fxp0 {
        unit 0 {
            family inet {
                address 192.168.5.3/23;
            }
        }
    }
}
routing-options {
    static {
        route 0.0.0.0/0 next-hop [ 192.168.5.254 177.19.xxx.xxx ];
    }
}