Timeframe consideration must be dependent on the way of your trading. If you are into scalping or day-trading then you can go for 30 min or 1 hr charts. But, I am also preferring to use 4hr candlestick patterns as they are filtering out the in-between noise and showing only major trend reversal points.
Timeframe should be set to current market situation and risk we are willing to take. On 4h candles closes support/sell signal will be much lower (~5-20%) rather tan on 5 min candles (~0.5-2%). Thats why when you are wrong you will loose much less on shorter timeframe. Its easier and safer to learn trading on shorter timeframes.