Hi Del, congratulations on your new purchase and well done for getting into reloading.

The very best thing you can do, what you must do in my humble opinion, is to get hold of a copy of Modern Reloading by Richard Lee.

The questions you as are good ones but ones that a basic grounding in home loading would answer for you. The issue is that there are all manner of other small factors and caveats that a new home-loader needs to know more than charge increments and OAL.

There have been a few questions on this forum lately that would benefit from a sticky or something on basic reloading.

In short however; try 0.2 grain increments, shoot five round groups, start at the OAL given in the load manual and full length resize and trim your brass.