Plants

Being very new to the hobby could someone please tell me the procedure for
adding plants to the aquarium and what to go for.

I have a 40g tank and I am going to keep Goldfish and Comets is there a
plant or plants that they particularly like, I have seen the plants in the
plastic pots which look very good and I don't remember them being around
when I was a youngster with my Goldfish then.

Being a newbie I am into week3 of my cycle, I have been adding cycle liquid
and from reading other articles in the newsgroups am expecting high ammonia
readings.

So far ammonia is showing as zero but Nitrite and Nitrate are quite high is
this possible without some kind of ammonia reading.

Thanks for putting up with my inexperience, but I hope to be up to speed
pretty soon (about 30 years I guess).

Cheers everyone,

--
Haynes'ey.