Well, your setup is quite challenging for imaging, so the first and most important is to be very patient and not to give up at the first problem . I do not want to discourage you , not at all , especially because I also started on similar hard way.
With this camera and the focal length of your scope you will have extremely small field of view. So you'll be limited to planetary imaging (you do not need guiding for that) and some very small DSOs (like planetary nebulae, small galaxies, ..).
If you have DSLR camera, consider as an alternative to your 662. Also , guiding of scope with such focal length by small guiding scope is challenging.
So what to do:
Fix your guiding scope as good as you possibly can
Align your guiding scope with your main scope as accurate as you possibly can . You can do that during the daylight aiming at some distant object like communication tower or any fixed point far away . Align it as precise as you possibly can as you might be using you guiding scope for star alignment or plate solve .
Next steps should be done during the night without the wind
-do polar align .either use Sharpcap (you need paid license for polar alignmen) or use NINA software which is free and has excellent 3 point polar alignment. If your polar alignment fails , use your guidescope to do polar alignment . Of course condition is that the main scope and guiding scope are very precisely aligned. Either way make sure that you put proper focal length into the software setup, whichever software you use
-after polar align , you could try to do 3 star alignment . With your setup it will be challenging to get the star into the view at you main scope. You can use your guiding scope if well aligned with the main scope to do 3star alignment. Far better is that you do plate solving instead of 3star alignment. By using any planetarium software point your scope to the desired object. It is assumed that you downloaded plate solving software (ASTAP, Astrotortilla, or any other. ) and belonging index files.
By imaging software initiate plate solving process, enabling synchronization with the mount. The routine will take the image, will try to plate solve and correct your mount, and will repeat it until the object is in the center of your scope. Due to small field of view , plate solve might fail. Use your guiding scope instead of the main scope. If they are aligned well, you will get your object in the center of both scopes.
-start PHD2, connect equipment, point your scope to close to celestial meridian and equator. Let software finds guiding star and initiate calibration .
- go back to your desired object and if not in the field of view, initiate plate solve again.
-start guiding , initiate your imaging sequence
-If you wish to avoid many frustrations do the following
Consider camera with larger sensor
Consider OAG (one with large prism) instead of guiding scope
because the small sensor of your camera, combined with small pixel and long focal length could be the source of frustration