I am learning metal work and will one day build my own motor cycle tank.
Do these have any internal sealing or bladder?
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Typically no. My bikes with steel tanks don't come with any sealant and are definitely steel on the inside. Same with alloy tanks. Plastic tanks now sometimes come with sealant to stop the ethanol warping them.
There are after-market products such as POR-15 that can seal tanks against corrosion however I don't know how effective they are.
All modern motorcycles with steel gas tanks have an internal coating that protects them against oxidation (rust). There are many brands of sealer available if the stock sealant has been compromised, typically due to heat or old fuel sitting in the tank for an extended period of time.
This google search for 'motorcycle gas tank sealer' yielded these results.