Hi Paul, Welcome to the site. You sure have picked a good forum to join to learn about salmon & trout fishing on Lake O. A lot of guys are willing to share tips on where to go and what to use. There's also buku info in the Search feature on most any questions you may have.
As far as not having a boat, that's not a big problem. There's a number of spots you can catch fish from shore. Especially in early Spring when the Browns are near shore and in the Fall during the Salmon runs up the Rivers & Tributaries. You might also keep and eye on or post in the Trade A Trip Section of the Forum for guys willing to share an open seat to do some offshore fishing. There's many Charter Capts. on here also that offer trips for very reasonable rates.
Good luck, thanks for joining, & have fun Paul, it's a blast out there.
Bob