If you take 295 up to 195 and get on the NJ turnpike there It will be $22.40 to exit 15E.. That is the best way IMO.
Unless you have oodles of time to get up there you can try to cut through but you will not be happy... Its well worth the 22 bucks.
Thats the best place to get on the turnpike. No need to get on earlier. 295 up is a nice ride. Some traffic area but it moves...
Not sure why your going to Philly... Nothing there and is worse then NYC IMO. Traffic, etc etc. Just a bad area.
It would be better to go see and stay a few days @ historic Cape may NJ, and do a 20 min ride to wildwood and see the historic boardwalk there.
From there the parkway up to exit 142A is $29.10.. Thats a nice ride . But trafficy after the raritan bridge.
As far as from maryland just take 95 and get around baltimore best you can. then 295 to the Del/memorial bridge.. Get in NJ as fast as you can.
Dont ride up PA side. You will not be happy.