I would suggest developing those new domains of yours. Parking a newly registered domain is not going to be very beneficial to you since new domains do not come with traffic. The traffic has to already be there. Parking primarily works for typo domains and for domains that previously had an established website with traffic coming on a regular basis.
Parking was the domain wave in the mid 2000's if you are just coming into the domain game your best bet is to semi develop into affiliate sites or niche adsense sites. traffic will only come to a domain you bought IF it was so generic that it brings in type in traffic OR the domain once hosted a popular website and people are coming in from bookmarks or previous links.