New Session, Import Session Data. Depends on version of PT, "kits" owned, etc.
Import Session Data and Import Audio allow conversion.
As far as the 44.1k/48k debate...
Some have found 48k will *generally* be a decent compromise when considering (ultra) expensive converters versus pro/con-sumer grade converters + 24bit 88.2k/96k. Since (generally speaking) most audio will be converted during session work (input, plug-in use, summing, etc), and many/most processes are not simple "halving" operations (LCD, GCD, etc), plus with 24/48k (or 24/96k in some cases) being ready for higher resolution end product usages, I prefer to opt for 48k/96k. I would rather *degrade* going to 44.1k than do so to upsample. With an arguable *optimum* sample rate being somewhere in the 64k area (eg, as per Lavry papers and various debates/opinions), the slight edge 48k affords.. Personally, I applaud the choice of 48k over 44.1k.