The best route would be to go to a top 4-year university for ur bachelor is (Ivy league, Hopkins, Stanford, & similar-tiered schools). Plastics & derm r among the most competitive specialties to get into (although they might not still be by the time you're applying to residency..8+ years down the road). To have a better chance at matching into one of those fields u need to go to a very strong med school, & to get into a very strong med school u need to go to a very good college. Yes, it is still possible to break into those fields from lower-ranked schools, but it is more difficult.
You cannot go to med school with just community college, although some people do go to a CC & transfer to a university. The main pro is that u will save tuition money. The main drawback is that it is tough to transfer into the top colleges from a CC, & u would be missing out on 2 years of opportunities. The specialties u mentioned look for a research background, & the earlier u start in research the better..a CC is not going to give u that background, whereas a 4-year university will. Yes, u could try to get involved in research after u transfer, but that would leave u only 1 year (instead of 3) to produce something valuable before applying to med school.