The general strategy in the end should consists of hamlet/warehouse to sift, provide + actions, provide + buys and watchtower to compensate the reduction in handsize. The point of this would be to play highways and smugglers. This also fends off against any embargoes nicely with the use of smugglers/watchtower to get around such problems. If you want to go for such a deck, silver/golds should be avoided because as you are trying to discard cards constantly, the golds/silvers will provide with significantly less benefit.
I think the cards you want to add at the start are hamlets, watchtowers and warehouses. Despite hamlet being the cheapest, this should take priority as without hamlets, the strategy will run out of gas quite quickly, especially without any trashing.
The problem with such a deck would be the lack of money. The downside with opening like this is that you won't be able to buy many pieces. Highway helps with that, but again, going with hamlets/warehouse/watchtowers doesn't really provide you with the best type of economy. Thus this deck is a little reliant on getting to $5 early and even may require you to buy a silver even though it may be detrimental later on.
Or you can go Oracle/BM.