As far as laning is concerned, yes, Twitch's laning phase is not good. However, it does not mean you shouldnt be trading or getting poke off on your opponent when the opportunity arrises. Play good positioning and be opportunistic. Having a support with hard cc makes laning with Twitch a heck of a lot easier, as you can more easily deal damage without taking any yourself.
As far as items are concerned, BoRK, GB, IE, and RH are core to his build. In what order you get them depends on the situation and your play style. For instance, I prefer more AS early on Twitch plus sustain since he is such an auto heavy champ with low health and has AD built into his ult, therefore I usually go BoRK into RH. If its a heavy squishy field, then rushing GB into RH is the best option I find. Deft and Doublelift tend to go the BoRK route too and do pretty well (in the games that I have seen them play Twitch).
Finally, Twitch is one of those ADC champions that the more you play him, the more of a feel you will get for him and the better you will do. His kit is easy to understand, but capitalizing on what makes him strong can take some time. Losing lane is not the end all for an ADC, especially for Twitch, just dont feed, farm up when you are able to, and make smart engagements. Without your ult, you can get wrecked by other ADCs even out of stealth (Lucian's burst is no joke). His game strength is a near linear increase with game length, so just stall till you can get the items you need. You'll do fine.