If you are using the term ridge beam correctly I assume you are trying to build a shop without ceiling joist. For a 22 ft span you are going to need to go with a LVL beam because I feel you are past the working load of home built beams such as 2 or 3 2x12 nailed together. Any good lumber yard can size the LVL beam and tell you what size support you need on each end.
If you are using ceiling joist then you need a ridge board and sizing of this is not that important because you are then dealing with compression load on this piece. Sizing of the ceiling joist is important to cover the span because this is what holds the walls from spreading apart. A 2x12 16in OC should cover 22ft span depending on your live load. (Junk in Attic)
Cheapest way money wise is down loading truss plans from one of the universities. Many of them have plans online and you can use these to build your own trusses.
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