League-of-legends – Champion Selection (With Randoms) How to do

1) As far as I can remember, "Solo" queue actually lets you queue up to a team of two. This may have changed. Unfortunately, Solo Queue is just that - you and some strangers - and if you want an easy strategy to climb the solo queue ladder, there isn't one. You're largely at the whim of the matchmaker, so the best you can hope for is to carry a team, perhaps by playing a ganking jungler such as Rammus, Shaco, or Nocturne.

The current metagame theory is that teams with a jungler > teams without, so by playing a strong jungler (assuming you aren't overestimating your skill) will give you the best odds, as an early game lead can be hard to overcome.

2) Queue dodging in a ranked game no longer reduces your ELO, but it does prevent you from queuing for ranked games for a substantial amount of time. If you want to raise your ELO, you need to play games, and you can't do that if you constantly queue dodge.

Roaming has become a popular addition to the metagame strategy, wherein one player does not lane nor jungle, but rather simply moves through the jungle/river to initiate ganks on lanes from level 1 and onward, until the teamfight portion of the game begins.

A roamer essentially guarantees that you're either running a solo lane, or two solo lanes if you have a roamer and a jungler. I've also seen a double roamer game played, though this tends to be less effective as enemies who are wise start playing defensively and reduce the effectiveness of your roamers, which put them behind in both CS and levels.

The qualities of a roamer can vary, but the general requirements are that they are mobile, can do burst damage, and have a strong stun or position altering (push, throw, etc.) ability. Taric, Evelynn and Alistar are all very popular choices for roaming. I've also seen Sion and Blitz play roaming effectively, but they were both out of a lack of a jungle spot on the team and normally suit better in a lane.

This strategy is similar to the "double jungle" mindset in that you get three solo lanes, with the exception that there is extra pressure on getting early kills to succeed. A definite risk vs. reward tossup, as successful roamers will quickly catapult your laners ahead in level / CS as well as demoralize your opponents, but unsuccessful roamers will fall just as far behind due to the lack of their presence in the laning phase.