Hi, Remy, and welcome to WriteWords
As Emma says, don't bother with a pseudonym at this stage in the game; leave that to the marketing dept of the publishing house to worry about.
If you need any help navigating the site, just give us a shout.
- NaomiM
<Added>- the disadvantages are the agents won't take you seriously if you ask them to use a pseudonym at the submission stage.