Am planning for a 1 day trip to Nikko and below are the places I'm interested in.

1) Lake Chuzenji
2) Akechidaira Ropeway
3) Tosho-gu Shrine
4) Kegon Waterfall
5) Tobu World Square
6) Yashio-no-yu Onsen

Would like to know what's the best route of visiting these places and how can I go about from one point to the another(E.G Lake Chuzenji to Yashio-no-yu Onsen)

Also, any kind souls can share on how to get to Yashio-no-yu Onsen?

I'm departing from Asakusa Station.

Please have a look at the simple "Oritentation" map here (the bottom one):
http://www.japan-guide.com/e/e3805.html

From the station on the right, you have Toshogu Shrine, then to the left there is the "Irohazaka" winding (zigzag-looking) road up to the Kegon waterfall and the lake. Akechidaira ropeway is located on the way up the winding road. Yashio-no-yu is located between the winding road and the central NIkko temple/shrine area, just off where the darker gray road branches off the road marked in pale gray.

I would suggest going in the following order - take the bus up toward the lake, but get off at Akechidaira on the way up because you cannot access the ropeway on the way down. At the top is the lake and the entrance to the waterfall. You can come down after visiting the waterfall and the lake (there is a pleasure boat ride), then visit the shrines. There are many shrines that you can visit; we could easily spend half day only around the temples/shrines.

1) Akechidaira Ropeway
2) Kegon Waterfall
3) Lake Chuzenji
4) Tosho-gu Shrine

THEN, after this if you have the time, you could go to:
5) Yashio-no-yu

You would have to back-track a bit, though. This Yashio-no-yu is located 12-minute walk from Kiyotaki bus station (according to the city website). And this bus stop is located between the winding road and the central Nikko area.

Was just wondering if I were to go Akechidaira Ropeway first and spend roughly 1 hour for the ride up and down the ropeway, after which will i be able to get a bus to go straight to Lake Chuzenji or do I have to go back to the station again and wait for the bus to go up?

In another words, are the Tobu Buses, say those towards Yumoto or Chuzenji operate like a circle in which i can hop on to the next stop?

http://www.japan-guide.com/e/e2358_002.html

and the official Tobu site here:

When you get to Nikko, you buy the Tobu bus pass, one of which would give you unlimited ride between (hop on, hop off) Nikko station and the Kego waterfalls + the lake. I think it cost 2,000 yen, and as one-way bus ride up to the lake costs 1,000 yen, it simply makes sense to buy the pass.

Another question please,to save me hours trying to nail it.... I visited Nikko 20 years ago and remember a viewing point looking out across to the Keagon falls but were being driven by a friend.

If I want to take our group to the viewing point with maybe the cable up to the top and also see the lake - are all these 3 things from the same bus stop? (Im thinking or hoping they are).

If so what bus stop do I want to see/do this?

There are three main observation decks. The best is accessible by paid elevator and is located close to the base of the waterfall. A second deck is located behind the elevator facilities and is freely accessible, but the views are not quite s good. The third one is accessed by a ropeway from a parking space, but it is considerably farther away from the waterfall than the other two.

If I want to take our group to the viewing point with maybe the cable up to the top and also see the lake - are all these 3 things from the same bus stop?

Not sure which viewing point and cable you are referring to, but the elevator and the lake can both be reached on foot from Chuzenjiko Onsen bus stop.

And then can we hop back on to a bus to continue down the other side of the zig zag to Nikko again?

From Chuzenjiko Onsen bus stop, yes.