Ok, let's see what I can make of it (though you'd be better off applying to someone more knowledgable, I will admit!). I'll take up the challenge in any case. I can't guarantee that I understand it properly or that my explanation will be at all relevant though!
To summarise my understanding very briefly: the planets are supposed to represent archetypal energies that are present in every person's life, the signs the mode of expression those energies take. The houses represent the areas of your life in which the relevant energies are active, so presumably a house with a strong planetary influence represents an area of particular significance. Venus represents the impulse of creativity, self indulgence, and through those love, affection, and sexuality.
The sign of Virgo channels energy in a down to earth, practical, and organised manner, and is very detail oriented. It's supposed to be associated with virtue and purity, but this does not mean literal virginity or sexual reserve, unless these things are particularly important to you. Venus in Virgo means more that your love, sexuality, and creativity are likely to be expressed in a Virgo style - the emphasis would therefore be on practicality, stability, common sense, attending to relevant details, and an avoidance of game-playing or drama - Virgo likes to be tidy, rational, and has a certain emotional reserve. Physical health and nutrition are supposed to be important in Virgo, and caring for a partner's bodily needs is likely to be an important way of showing affection, maybe more than direct expressions of love or emotion, etc. Finding a stable partner may actually be difficult as the innately crictical nature of Virgo is likely to find a lot of faults in potential mates.
The first house is the house of outward appearances - how someone likes to put themselves across, so the sign and any planets there are quite significant in terms of your socialising and how you like to be seen (and are seen) by others. Venus in the first house suggests you are quite outgoing and sociable, with a tendency to be relaxed and casual in your associations with people, and able to form friends, get ahead in the world, and acquire lovers easily, if that's what you want to do, which it probably is. You're more likely to do these things for the pleasure of doing so than any long term ambitions however, unless something elsewhere in your chart gives you a more definite drive. Being on your own would be quite hard for you, as your pleasure and creativity are so linked to your social relations. Venus in this position is supposed to make you very aware of your personal appearance and fond of beautiful clothes and anything that will enhance your appearance, along with a certain tendency to self-indulgence, and a playful tendency. This will be moderated to some degree by the Virgo influence however, as described above.
It's probably also going to make you very keen to nurture and care for others, probably in the physical sense too in the case of lovers etc, and to be very aware of any health issues they may have, along with a tendency to analyse, rather than experience, emotions, and to dwell on their faults. Since Virgo is linked with practical reason and is channeling visceral, emotional, instinctive energy, you ought to be a naturally good psychologist, as both are present but neither is able to dominate the other; you should therefore be able to analyse emotions in your interactions with others as they happen and make practical sense of them, without getting carried away.
Anywhere near right? Most of this is guesswork, based on the few principles I know!