DECIPHER Hydraulic Disk Brakes Bleeding Manual has the step by step directions you seek. A couple things I'll point out:
Do change the rubber washers on the drain and fill ports. The directions do a nice job parenthetically telling the reader to check these and replace as needed. I suggest just changing these for the appropriate replacement washers (size and type of rubber must be correct).
Make sure you replace all the old DOT4 fluid. Over time, DOT fluid will attract water into the system. This diminishes performance. The water can even boil in the a system that is used hard and develops heat. Heat that would be tolerated without performance issues if the DOT fluid is pure.
Be careful with leaks as DOT is very hard on paint. It's not safe or smart to get it on you and not wash it off ASAP. It doesn't do real good if it gets on the pads or rotors.
Back to the bolts, the seal to their openings is complete if there's adequate torque of the bolt and rubber washer. Torque wrench makes it for sure.
I'll leave the rest to your skills and the Promax directions at the link.