Say someone had a time Machine and they just took most of our modern tech and say 800 people 10,000 years into past what do you think will happen? (Feel free to make a theoretical timeline in fact i encourage it)

I don't understand why you would need to bring tech back with you. Just some cash and some info to bring back with you. Go back to when Microsoft,Yahoo, Apple, or Google first went on the stock exchange. If you really need to make money fast go back to a sporting event and bet a little money here and there.

No need to go that far. Read 1632 (and if you like it, keep reading, the series is quite long by now) by Eric Flint. It concerns a small American mining town from the year 2000 that, through a cosmic accident, is transported to central Germany in the year 1631 (most of the story takes place in 1632 though, hence the title). It really is a fantastic series of books, exploring not only the effects of modern technology on an earlier society, but also very much the effects of a modern mindset.

I Shall Check him out I was thinking more along the lines of mass time travel lots of people

Please do. The first book is freely (and legally) available at the link I posted, in just about any electronic format imaginable.

Honestly that would depend entirely on their ability to create power and refine natural resources. The strength of going into the past isn't technology itself, but the knowledge of that technology. With only the tech but not the knowledge, their impact might be significant, but much of it would be short-lived. Batteries would wear out, machinery would break down, and so on. Aluminum is the most common metal on the planet, but unless you know how the Hall-Heroult process works, you can't actually access any of it. To get really going you would actually have to in a sense "tech up" from zero just to be able to harvest the minerals you'd need.

The social and cultural impacts of transplanting modern society into the Neolithic could be pretty interesting, though.

And if the natives stirred up trouble, we could bomb them back to the ... nevermind.

What if we started contact with the roman empire and we use time travel more as a travel device use it to support each others economy's? (given that we omit the past changes the present rule)

People that would be transferred back would need to be able to recreate the tech. Tech breaks, consumables are used up, you would need knowledge of these items to keep them working. Not to mention there are a lot of people that would be of no use to society in the past...your Paris Hilton's, Jersey Shore Stars, etc. They could even be a hindrance or hurt your chances to survive in the past.

The people will most likely be screwed. We consume a whole lot of energy to maintain our way of life, and a great deal of that energy comes from somewhere else: you may have a nuclear power plant in your neighbourhood, but if you have no idea where the fuel for that came from, you won't be able to run it forever. Even if you knew where to find uranium, you'd still need to mine and refine it, and with finite time, resources and manpower, you just couldn't.

As for opening a portal to the Roman Empire, it's a stupid idea because the Romans would have nothing we want (apart from a quaint culture of orgies and lead poisoning, I suppose), so there goes trade right out the window. Chances are that America would just invade them anyway.

Kinda cynical but true we would have a whole lot more to consume and products would be cheaper then ever

Exactly, which reminds me of the old Douglas Adam's scenario. Mind you, that was a replacement Earth, but its a similar idea ;)

From the Wikipedia article about Arthur Dent
In most versions of the series, Arthur and Ford eventually find themselves back on Earth – but two million years in the past, marooned with the useless third of the Golgafrincham population (consisting of hairdressers, account executives, film makers, security guards, telephone sanitisers, and the like). The Golgafrincham arrival spurs the extinction of the native "cavemen" (although, as Ford Prefect pointed out, they did not live in caves, to which a witty repartee was that they 'might have been getting their caves redecorated'), resulting in the human race's eventual replacement by a shipload of middle managers, telephone sanitisers and hairdressers.

There's an easy fix for that: instead of a time machine put them in a teleporter, and instead of 10,000 years in the past set it at "Center of the Sun".

... insurance salesmen, personnel officers, management consultants, and telephone sanitisers?

Edit: Oh, ninja'd 6 hours hence. Those damn time machines.