My First Planted Tank , Help Is Much Appreciated

Iv just set up my first planted tank last nite and it looks amaZing if I do say so myself !
It's a 54 litre (dimensions 60 by 30)I used tropicas plant growth substrate and capped it with a sand and fine gravel mix which I got from pets at home.
I have a 25- 30 watt lighting unit but could only find a 15 watt light that fits the length of the tank which I'm annoyed about .
Another thing is I got my plants from pets at home and tbf they all seems to be good quality but non of the staff new the names ,I got some dwarf hair grass, and the rest I can only try to match of pictures I see on the internet.
I have no co2 but om thinking about either the liquid form , or tropicas disposable co2 any recommendations would be helpful .
I also need to pick ups some fertilizer in the next few days.
 I have a heater running and my filter which has been running in my 80 litre Afew weeks ,but thinking of changing it because it's crazy loud !
 I would just like some info on the lighting situation any tips on sand and co2.
The plants are pearling already wich I assume is a good thing
Any information,opinions and questions are welcome .oh and if any one nos the names of the plants the would be great il try post a picture

Aah I see, and Yeh the hair grass was labelled but the rest wernt.

Have you any experience or knowledge on the disposable co2 ?
Or liquid form?

And they also have the tropica plant fertilizer in there so I will probably get that on a few days

Last question do you think the light I have is okay for the time being?

Thx for the reply