Bienvenidos, Acedeck!
Regarding whether a noun is masculine or feminine, sometimes the reasoning and "logic" behind assigning gender escapes me too. Don't try to overanalyze it... you'll drive yourself crazy!! Just learn the gender as you learn the noun, and it'll make things so much easier for you (_la_ casa, _el_ pollo, etc.) In the Beginning Book Grammar section, lesson 1.2, it explains how to distinguish how to determine the gender of most nouns. It's very helpful.
As for what you're calling "double words"... that's easy too. In English, we have to put a noun or pronoun in front of most verbs, for example "I want a bottle of water." In Spanish, the noun or pronoun isn't necessary, as the conjugation of the verb tells you what the pronoun is. So, using the example I gave you, in Spanish it would be "(Yo) quiero una botella de agua." The pronoun is used only for emphasis or clairification. The form of the verb _querer_ that I used tells you automatically that the pronoun that precedes it is _yo_ (I). Most Spanish verbs follow a very easy format. All regular verbs that end in -ar (like hablar) are conjugated the same way. There is a specific way to conjugate all regular -er and -ir verbs (like beber and vivir) as well. Learn the format, and you'll be able to conjugate any of these regular verbs on the fly in a snap. Some verbs you just have to memorize, unfortunately, like estar, ser, ir, and dar. The "up" side is that this is WAY easier to learn and makes much more sense than French or English!! I feel sorry for folks that have to learn English as a second language. We have exceptions to every single grammatical rule, and most of our idioms make absolutely no sense at all.
You'll get the hang of it as you start conjugating verbs. Using the verb _hablar_ (to speak), I'll show you what I mean.
(yo) hablo - (I) speak
(tú) hablas - (you) (informal) speak
(él, ella, usted) habla - (he, she, or you) (polite, formal you) speaks
(nosotros) hablamos - (we) speak
(vosotros) habláis - (all of you) speak ** _Vosotros is used only in Spain. The Latin American equivalent is ustedes, which is conjugated differently._
(éllos, ellas, ustedes) hablan - (they, all of you) speak
éllos is used for "they" when speaking of a group of all males, or a mixed group, and ellas is used when speaking of a group of all females. See how the verb changes?
Hope that clears it up for you. There's a good book on verbs you can get, the Big Red Book of Spanish Verbs. I got mine at Amazon.com. It conjugates a gazillion verbs in every tense known to mankind.
¡Buena suerte!