I aproach hunting whitetail vs mule deer very different for this reason I would advise picking 1 of the two species for starters. In my opinion I would focuse on the species that is in higher numbers near your location. Than do as much reaserch on the habitat the species proffers, their habits and how they change throughout the season. Focuse on the tactics that are more adapted to the species.
This in my opinion would be a good starting point for starting out. Rather than try to learn too much at once focusing on 1 can help speed up the learning curve first season. Can always expand species as you go
If both species are an option ask your self what style of hunting interests you more?
Whitetail is more about patterning the deer. Often thick bush close corders hunting lower elevation. Ambush is my go to but under the right conditions still hunting can be good. Calling in the rut is more effective with whitetail. Whitetail are spookier and less forgiving if alarmed
Mule migrate more so throughout the year patterns are short term in comparison. Depending on the location and time of year you can hunt alpine to low elevation. Terrain is often steeper and more physical. Tactics are more so spot and stalk or still hunting. Hunt can take place in wide open areas or timber ridges. Mule deer the range of the shot opertunity can really vary depending on where and how you hunt. Mule deer are more likely to stop and give a second chance if you spook them. Some times simply whistling can stop them long enough for a shot
Also recommend picking an area with deer and learning it in and out rather than driving all over looking for a dream location. In depth knowledge on an OK location trumps no knowledge of a great location in my opinion.
Or you could drive around try to get lucky and stubble into deer. Expensive not my thing but some like it
Best of luck pick what interests you most and gain as much knowledge you can both are rewarding to hunt but very different
If your near the coast don't ignore the little black tail they can be a fun yet frustrating deer to hunt