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Whether you would need a power meter depends on what type of cycling you do. If you are time limited and want to get the most from your training, then a power meter can help make the most of your time – providing you can interpret the numbers and structure training, or get a coach to help. On the other hand, if you enjoy riding your bike for being outside, the scenery, chatting to mates and use riding the bike for relaxation and recreation, then no, looking at power numbers won’t be a benefit.

This depends on how long your legs are, typically taller people have longer legs. Smaller riders would be better suited to shorter 165 - 170mm cranks, average size riders usually go for 172.5 - 175mm and larger riders usually choose 175 - 180mm. Cranks are available in 2.5mm increments from 165mm to 180mm although some sizes can be more difficult to find, especially at the shorter and longer extremes..

This depends on the groupset and the chainset. The big groupset manufacturers recommend using all their components in a groupset, however some smaller manufacturers such as Hope, Rotor and DMR make chainsets which integrate with various different groupsets.

We always recommend following manufacturers instructions for fitting any component. The Youtube channels of Park Tools and GCN Tech have very indepth and comprehensive advice for completing all sorts of jobs on bikes, these are also worth watching particularly if you are inexperienced or unsure.