The Common Agriculture Policy (CAP) is not a single programme on its own but a collection of several different programmes dealing with agriculture and rural development. Notice that when you ask for concrete policies you're not asking for legislation but strategy (Policy):
A policy is a deliberate system of principles to guide decisions and
achieve rational outcomes. A policy is a statement of intent, and is
implemented as a procedure or protocol. Policies are generally adopted
by a governance body within an organization.
That being said the main objectives of the modern CAP were established in the Treaty of Lisbon (Article 39; 2007):
(a) to increase agricultural productivity by promoting technical
progress and by ensuring the rational development of agricultural
production and the optimum utilisation of the factors of production,
in particular labour;
(b) thus to ensure a fair standard of living for the agricultural
community, in particular by increasing the individual earnings of
persons engaged in agriculture;
(c) to stabilise markets;
(d) to assure the availability of supplies;
(e) to ensure that supplies reach consumers at reasonable prices.
There were more recent reforms (2013, see also this) and others are planned in the future following the Consultation on modernising and simplifying the common agricultural policy (CAP) (whose results you can see here).
In 2018 the Proposal for a REGULATION OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL establishing rules on support for strategic plans to be drawn up by Member States under the Common agricultural policy (CAP Strategic Plans) [...] was made which proposed:
(a)Support viable farm income and resilience across the EU territory
to enhance food security;
(b)enhance market orientation and increase competitiveness including
greater focus on research, technology and digitalisation ;
(c)Improve farmers' position in the value chain;
(d)Contribute to climate change mitigation and adaptation, as well as
(e)Foster sustainable development and efficient management of natural
resources such as water, soil and air;
(f)Contribute to the protection of biodiversity, enhance ecosystem
services and preserve habitats and landscapes;
(g)Attract young farmers and facilitate business development in rural
(h)Promote employment, growth, social inclusion and local development
in rural areas, including bio-economy and sustainable forestry;
(i)Improve the response of EU agriculture to societal demands on food
and health, including safe, nutritious and sustainable food, as well
as animal welfare.
Consequently the Future of the common agricultural policy (beyond 2020) was established which defines nine objectives:
The same source has several links to factsheets and legal texts which you can explore. Also if you really want to go heads on towards legislation (as concrete as it gets) you can use EUR-LEX (EU law portal).
EDIT: CAP is not in itself an institution. It's just a set of guidelines (policy) defined in Treaty, whose future regulations, directives (and so on...) must respect (otherwise they might be halted following a CURIA decision).
I believe an adequate analogy would be: (1) CAP defines the grand strategy, (2) EU regulations (which must respect CAP) set the rules for EU members, (3) EU members build their own national legislation respecting EU rules and their own strategy. So you can expect more and more concrete legislation the further you go down the chain. At the last level you'll have different legislation in different member states.
Relating to your question: "For instance, regarding (g) how does one plan to attract young farmers (whether the related legislations are still to come or not) ?"
You can refer to Regulation (EU) No 1305/2013 of the European Parliament and of the Council of 17 December 2013 on support for rural development by the European Agricultural Fund for Rural Development (EAFRD) and repealing Council Regulation (EC) No 1698/2005 which sets member state rules to reach the CAP objectives (for example financial incentives, start-up aid, and in what circumstances). Here is a quote from that document:
Farm and business development
- Support under this measure shall cover:
(a) business start-up aid for:
...(i) young farmers;
...(ii) non-agricultural activities in rural areas;
...(iii) the development of small farms;
Considering the rules set by this document member states must update their own legislation to follow the EU regulation. To see even more concrete legislation you'll have to move down towards national legislation which depends on member state (there are a few exceptions, I believe, such as the direct payment system).
If you explore the link previously given in EUR-LEX you'll find other regulations such as the Commission Regulation (EC) No 889/2008 of 5 September 2008 laying down detailed rules for the implementation of Council Regulation (EC) No 834/2007 on organic production and labelling of organic products with regard to organic production, labelling and control which sets the rules for labeling and production of organic products (so that "organic" mean the same for all member states).
And here is another relating to the standardization of eggs: Commission Regulation (EC) No 589/2008 of 23 June 2008 laying down detailed rules for implementing Council Regulation (EC) No 1234/2007 as regards marketing standards for eggs