Need help valuing some Mego figures in my collection

[Danzvader78]

Hi I am a bit stumped about valuing rare Megos that I have in my collection
Those include

Dr Kromdrome missing helmet/and staff (costume in good condition)
Star Trek Romulan missing golden helmet and red tricorder accessory
Variant Australian Wonder Woman (Figure in perfect condition with hair tape to keep hair in fine shape)
12" Captain America with sealed shield in plastic box and original box has been folded flat
Mint sealed and carded Isis figure (The finest example I ever seen so far)

Would appreciate input as thinking about selling them

Thanks