Surag-It is good you are thinking about some of these things early.
Step 1 is to decide MD vs. PhD vs. MD-PhD. I wouldn't even think about neurology residency etc. at the moment since that is subject to change, is a long ways off, and will just muddle the main question at hand.
Take some time and figure out what kind of research you want to do. It sounds like you have some ideas. If you are inclined toward basic science you will want a PhD or MD-PhD. A PhD is much, much faster but carries significant risk in terms of future employment and potential income. If you don't quickly get the pubs and grants your career as a leading scientist is over. An MD-PhD on the other hand is a very long road and forces you to try to juggle two things for much of your training, but gives you a lot of options.
While I know many outstanding MD-only scientists, in this day and age of debt and numerous other barriers in clinical education it is very hard to go into basic science with just an MD. Doing science as an MD-only usually entails an extended research fellowship or post-doc after residency. Residency is a time for clinical training, and any research you do will just be getting your feet wet unless you have significant prior experience. When it comes to basic science, as you may know, it can take many years to gather enough data to publish a high profile story. Even at heavily research oriented residencies (Hopkins, UCSF, Partners, UCLA, Wash U to name a few of many), as it stands now you will have a maximum of 6-12 months over 4 years you can solely dedicate to basic science work. At many programs, protected research time is only a couple months.
This MD-only route to being a physician scientist is possible, but you will basically be starting from square one in a new "profession" (basic science) in your late 20's and early 30's when your PhD peers are in some cases already tenured professors and your MD friends are starting to make some serious money for their families. Meanwhile your hard won clinical skills atrophy and your debt goes through the roof.
If you want clinical research, then MD, MD-PhD, or PhD in clinical research are all options. MD is maybe the best combination of employment options and speed.
Lastly try to find a mentor at or near your undergrad school regarding these issues. Also, try to avoid the hype of getting into medical school." For many college students the thought of getting an MD sounds a lot more prestigious and exciting than going to grad school. I think this draws some students into medicine that might be better off getting a PhD or going into some other profession. The excitement of becoming a medical student wears off (rather fast I might add, just like becoming a resident lol), and if you mostly want to do research you may not be happy getting an MD and focusing on clinical training for 4-10 years (at huge financial cost).
Once you figure out which degree is best for you everything else will work out. I grappled with some similar issues at one time or another and am very glad I ended up with an MD-PhD. The choice is definitely not for everyone however.